In the field of game development on Roblox Game Designer (Game Level Designer) or Can I work as a screenwriter?

I love designing games and writing scenarios.
But I don’t know what to do because most people don’t hire people to develop them professionally, I’m too young (16) to hire someone to develop them for me, and I think it would take too much time to develop them on my own…
I have a lot of good ideas, but because of the above problems, most of them stay in the game plan or
disappear in my head.

What should I do?

I’m Korean and English is still new to me, so I might have some grammar mistakes or something.
I’m new to Creator Hub and I’m still awkward. I would be grateful if you could explain it kindly).