I am 17 years old. I have been coding since I was 11. I personally think that roblox as a game engine is perfect for people who want to make a game and don't want to learn complex concepts. I personally have made games on roblox and on godot. My godot game was an fps game that actually gained about 350 users before I inevitably had to shut it down. It was an online multiplayer game, and getting networking set up was not difficult. With this in mind, I feel as if roblox has almost scammed you. Let's take the fact that 80 robux is worth $1 when a user buys it. You cashed out 1,100,000 robux. When dividng that by 80, that means you should have been payed somewhere around 14,000 * 0.70 (30% marketplace fee). This sounds awesome, after all, game stores like steam and epic games and consoles etc all charge some fee for working with their store. YET! You were paid ONLY 30% of what your game brought in for roblox. and 30% is pushing it.
As someone whose developed games on other platforms, I could only wish for someone to take roblox's game engine and un-robloxify it. If I could provide my own servers, my own hosting, my own authentication, my own everything... I would. I did it for my game, and it wasn't that hard. Load balancing was available too, all the fun stuff, and I didn't mind.
In your opinion, if there was an option for you to have made your game in an environment not owned by roblox. I.e. the studio is the same, but instead of publishing to roblox, you're reponsible for users discovering your game, your responsible for publishing your game... YET you get atleast 70% of profits. Which in your case means going from 4000 USD to 10K USD.
Would you have taken this opportunity or would you have stuck with roblox?