You see; you are in this category named game design support. Not game idea support.
There’s a HUGE difference between the two and I wish you to learn it (and everyone else that reads this). Please read THE WHOLE THING: https://en.wikipedia.org/wiki/Game_design, it is a 5-10 minutes read and it will help you for the rest of your Roblox career. If you stumble upon any issues, I have a thread which discusses some obstacles in game design.
Before anything else: Establish your values, purpose and etc. How you want to approach things to integrate your values within your products/services. And then lastly what you want to do.
I suggest you open up a document and start with the normal format; Game loop, progression loop and social loop.
If you’re unsure how to start, here is a GREAT template you could take use of https://docs.google.com/document/d/1-I08qX76DgSFyN1ByIGtPuqXh7bVKraHcNIA25tpAzE/edit