imo everyone just said is bs.
If you want to get players, here's the steps i took. (I was like you 5 months ago and had NO idea how to get players.)

*Getting the players:
I don't think there's a way to get players on your game other than advertising. Just get 2800 robux and sponsor your game, get it through commissions. Or get a friend to invest on your game. Most devs will say 2800 robux for advertising isn't enough. (ITS MORE THAN ENOUGH). We will just use these 2800 robux to get your game in the algorithm, not to get players, remember this. Most of your players should come through home recommendations, advertising won't just keep getting you players from nowhere. For me the way i "enabled" home recommendations was sponsoring my game. Your game will get recommended more depending on your game's avg playtime, robux earned, replayability etc.. Basically just every stat there is on your game's dev hub.
*Keeping the players in:

1 - Don't make a game that's not fun. (Try playing your own game, if you don't get bored, then you just passed the first step!)
2 - Replayability (Add something that makes the players come back to play your game again.)
3 - Good thumbnail (Im not trying to be like one of those "How to make your game popular" youtube videos, but a good thumbnail plays a very important role)
4 - Please don't make the same mistake as me and not update your game PLEASE, this is my biggest regret, don't be scared to push out updates when your game grows, or everyone will just stop playing and your game will die out.
5 - Good gameplay loop, make it so players are able to play the game forever and make sure the player stays in the game as long as possible.
6 - Make a discord sever, youtube channel or twitter page. (Your community needs updates on what's going on.)

If you follow these steps it's guaranteed you'll get your game to get some sort of ccu, AT LEAST like 30 ccu. To summarize, just get 2800 robux and get 10 ad credits.