Hello, please indicate which game are you talking about?
Normally, you should sponsor/advertise it on Roblox if your game is for 13+ players, and also try social medias.
Remember to have a catchy title, attractive icon and thumbnails, if possible, also a teaser trailer!
I could say that this game doesn’t differ at any point with other games like those.
You should make players compete (racing system) to at least give them a point of beating that obby.
Also the GUI should be “softer”. <= You should animate the GUI a little bit to make it look interesting for an eye. <= Also don’t use roblox’s leaderboards. This start is an abomination. Instead I would change almost entire point of that obby. I would add a lobby map and also the round system. You should also add pets/rewards/quests/boosts.
Pets is the must do thing in roblox game development ofc.
Rewards are to keep the thoughts of player what they can get.
Quests will basically do the same what do rewards do.
Boosts/Perks also will add the point to the reward/quest system, so player can progress faster.
And also don’t make it look like a P2W.
In summary we can cay that your game lacks a lot of fundamentals for a good and catchy game.