I have downloaded your font and have followed the steps you told, but it's not working

The font is properly downloaded I am sure, because it's appearing in my kde's font management, I have a fontconfig with conf.d in which there is a file named 01-emoji.conf

output of fc-cache -f -v
`
Font directories:
/usr/share/X11/fonts/Type1
/usr/share/X11/fonts/TTF
/home/taham/.local/share/fonts
/home/taham/.local/share/flatpak/exports/share/fonts
/var/lib/flatpak/exports/share/fonts
/usr/share/fonts
/usr/local/share/fonts
/home/taham/.fonts
/usr/share/fonts/aajohan-comfortaa-fonts
/usr/share/fonts/abattis-cantarell-fonts
/usr/share/fonts/abattis-cantarell-vf-fonts
/usr/share/fonts/adobe-source-code-pro-fonts
/usr/share/fonts/gdouros-symbola
/usr/share/fonts/google-carlito-fonts
/usr/share/fonts/google-crosextra-caladea-fonts
/usr/share/fonts/google-droid-sans-fonts
/usr/share/fonts/google-noto
/usr/share/fonts/google-noto-emoji
/usr/share/fonts/google-noto-sans-cjk-vf-fonts
/usr/share/fonts/google-noto-sans-mono-cjk-vf-fonts
/usr/share/fonts/google-noto-vf
/usr/share/fonts/jomolhari-fonts
/usr/share/fonts/liberation-mono
/usr/share/fonts/liberation-sans
/usr/share/fonts/liberation-serif
/usr/share/fonts/lohit-assamese
/usr/share/fonts/lohit-bengali
/usr/share/fonts/lohit-devanagari
/usr/share/fonts/lohit-gujarati
/usr/share/fonts/lohit-kannada
/usr/share/fonts/lohit-marathi
/usr/share/fonts/lohit-odia
/usr/share/fonts/lohit-tamil
/usr/share/fonts/lohit-telugu
/usr/share/fonts/open-sans
/usr/share/fonts/opensymbol
/usr/share/fonts/paktype-naskh-basic
/usr/share/fonts/rit-meera-new-fonts
/usr/share/fonts/sil-mingzat-fonts
/usr/share/fonts/sil-nuosu-fonts
/usr/share/fonts/sil-padauk
/usr/share/fonts/stix-fonts
/usr/share/fonts/urw-base35
/usr/share/fonts/vazirmatn-vf-fonts
/usr/share/X11/fonts/Type1: skipping, no such directory
/usr/share/X11/fonts/TTF: skipping, no such directory
/home/taham/.local/share/fonts: caching, new cache contents: 109 fonts, 0 dirs
/home/taham/.local/share/flatpak/exports/share/fonts: skipping, no such directory
/var/lib/flatpak/exports/share/fonts: skipping, no such directory
/usr/share/fonts: caching, new cache contents: 0 fonts, 36 dirs
/usr/share/fonts/aajohan-comfortaa-fonts: caching, new cache contents: 3 fonts, 0 dirs
/usr/share/fonts/abattis-cantarell-fonts: caching, new cache contents: 5 fonts, 0 dirs
/usr/share/fonts/abattis-cantarell-vf-fonts: caching, new cache contents: 6 fonts, 0 dirs
/usr/share/fonts/adobe-source-code-pro-fonts: caching, new cache contents: 14 fonts, 0 dirs
/usr/share/fonts/gdouros-symbola: caching, new cache contents: 1 fonts, 0 dirs
/usr/share/fonts/google-carlito-fonts: caching, new cache contents: 4 fonts, 0 dirs
/usr/share/fonts/google-crosextra-caladea-fonts: caching, new cache contents: 4 fonts, 0 dirs
/usr/share/fonts/google-droid-sans-fonts: caching, new cache contents: 16 fonts, 0 dirs
/usr/share/fonts/google-noto: caching, new cache contents: 181 fonts, 0 dirs
/usr/share/fonts/google-noto-emoji: caching, new cache contents: 0 fonts, 0 dirs
/usr/share/fonts/google-noto-sans-cjk-vf-fonts: caching, new cache contents: 40 fonts, 0 dirs
/usr/share/fonts/google-noto-sans-mono-cjk-vf-fonts: caching, new cache contents: 20 fonts, 0 dirs
/usr/share/fonts/google-noto-vf: caching, new cache contents: 265 fonts, 0 dirs
/usr/share/fonts/jomolhari-fonts: caching, new cache contents: 1 fonts, 0 dirs
/usr/share/fonts/liberation-mono: caching, new cache contents: 4 fonts, 0 dirs
/usr/share/fonts/liberation-sans: caching, new cache contents: 4 fonts, 0 dirs
/usr/share/fonts/liberation-serif: caching, new cache contents: 4 fonts, 0 dirs
/usr/share/fonts/lohit-assamese: caching, new cache contents: 1 fonts, 0 dirs
/usr/share/fonts/lohit-bengali: caching, new cache contents: 1 fonts, 0 dirs
/usr/share/fonts/lohit-devanagari: caching, new cache contents: 1 fonts, 0 dirs
/usr/share/fonts/lohit-gujarati: caching, new cache contents: 1 fonts, 0 dirs
/usr/share/fonts/lohit-kannada: caching, new cache contents: 1 fonts, 0 dirs
/usr/share/fonts/lohit-marathi: caching, new cache contents: 1 fonts, 0 dirs
/usr/share/fonts/lohit-odia: caching, new cache contents: 1 fonts, 0 dirs
/usr/share/fonts/lohit-tamil: caching, new cache contents: 1 fonts, 0 dirs
/usr/share/fonts/lohit-telugu: caching, new cache contents: 1 fonts, 0 dirs
/usr/share/fonts/open-sans: caching, new cache contents: 10 fonts, 0 dirs
/usr/share/fonts/opensymbol: caching, new cache contents: 1 fonts, 0 dirs
/usr/share/fonts/paktype-naskh-basic: caching, new cache contents: 1 fonts, 0 dirs
/usr/share/fonts/rit-meera-new-fonts: caching, new cache contents: 1 fonts, 0 dirs
/usr/share/fonts/sil-mingzat-fonts: caching, new cache contents: 1 fonts, 0 dirs
/usr/share/fonts/sil-nuosu-fonts: caching, new cache contents: 1 fonts, 0 dirs
/usr/share/fonts/sil-padauk: caching, new cache contents: 2 fonts, 0 dirs
/usr/share/fonts/stix-fonts: caching, new cache contents: 9 fonts, 0 dirs
/usr/share/fonts/urw-base35: caching, new cache contents: 69 fonts, 0 dirs
/usr/share/fonts/vazirmatn-vf-fonts: caching, new cache contents: 10 fonts, 0 dirs
/usr/local/share/fonts: skipping, no such directory
/home/taham/.fonts: skipping, no such directory
/usr/share/fonts/aajohan-comfortaa-fonts: skipping, looped directory detected
/usr/share/fonts/abattis-cantarell-fonts: skipping, looped directory detected
/usr/share/fonts/abattis-cantarell-vf-fonts: skipping, looped directory detected
/usr/share/fonts/adobe-source-code-pro-fonts: skipping, looped directory detected
/usr/share/fonts/gdouros-symbola: skipping, looped directory detected
/usr/share/fonts/google-carlito-fonts: skipping, looped directory detected
/usr/share/fonts/google-crosextra-caladea-fonts: skipping, looped directory detected
/usr/share/fonts/google-droid-sans-fonts: skipping, looped directory detected
/usr/share/fonts/google-noto: skipping, looped directory detected
/usr/share/fonts/google-noto-emoji: skipping, looped directory detected
/usr/share/fonts/google-noto-sans-cjk-vf-fonts: skipping, looped directory detected
/usr/share/fonts/google-noto-sans-mono-cjk-vf-fonts: skipping, looped directory detected
/usr/share/fonts/google-noto-vf: skipping, looped directory detected
/usr/share/fonts/jomolhari-fonts: skipping, looped directory detected
/usr/share/fonts/liberation-mono: skipping, looped directory detected
/usr/share/fonts/liberation-sans: skipping, looped directory detected
/usr/share/fonts/liberation-serif: skipping, looped directory detected
/usr/share/fonts/lohit-assamese: skipping, looped directory detected
/usr/share/fonts/lohit-bengali: skipping, looped directory detected
/usr/share/fonts/lohit-devanagari: skipping, looped directory detected
/usr/share/fonts/lohit-gujarati: skipping, looped directory detected
/usr/share/fonts/lohit-kannada: skipping, looped directory detected
/usr/share/fonts/lohit-marathi: skipping, looped directory detected
/usr/share/fonts/lohit-odia: skipping, looped directory detected
/usr/share/fonts/lohit-tamil: skipping, looped directory detected
/usr/share/fonts/lohit-telugu: skipping, looped directory detected
/usr/share/fonts/open-sans: skipping, looped directory detected
/usr/share/fonts/opensymbol: skipping, looped directory detected
/usr/share/fonts/paktype-naskh-basic: skipping, looped directory detected
/usr/share/fonts/rit-meera-new-fonts: skipping, looped directory detected
/usr/share/fonts/sil-mingzat-fonts: skipping, looped directory detected
/usr/share/fonts/sil-nuosu-fonts: skipping, looped directory detected
/usr/share/fonts/sil-padauk: skipping, looped directory detected
/usr/share/fonts/stix-fonts: skipping, looped directory detected
/usr/share/fonts/urw-base35: skipping, looped directory detected
/usr/share/fonts/vazirmatn-vf-fonts: skipping, looped directory detected
/usr/lib/fontconfig/cache: not cleaning unwritable cache directory
/home/taham/.cache/fontconfig: cleaning cache directory
/home/taham/.fontconfig: not cleaning non-existent cache directory
/usr/bin/fc-cache-64: succeeded

`