You could hire me for 50 Robux, I am a game planner who will help a lot. Also, a quick tip to start: Adding more than one area will really help. Say have an area for everyone so people will want to stay even more.
Since Roblox is made up of a majority of kids, you should make a game kind of like Adopt Me! or Meepcity, or a roleplay of something popular that hasn’t been created in Roblox yet or one of those popular roleplay games(I don’t play roleplay games so I don’t really have any good ideas) You should have something in the game that would keep younger audiences interested. It of course has to be kid-friendly.