Click bait is always the answer xD, btw only BC memebers can advertise and make money off of games.

To make your place popular, you can buy/create advertisements on the site. To make it really effective though, you need to spend lots of money on the game. (Thats why I don't do it)

You don't just program a game to become popular. There are steps.
You can support your game's success on Roblox by creating advertisements and adding features that can make your game seem appealing. Try to make your ads, gamepasses (if you have any in said game), and game thumbnail look interesting and appealing to attract people's attention. However, this will take a good amount of robux in order to achieve. It can be done!
PS Usually clickbaiting with fake YouTuber endorsements work. Saying that someone like Flamingo played your game can attract a lot of players. I just don't recommend it first thing because it's a little dishonest, though people do it all the time.

I really don't know what to say here. I honestly do fine and I'm growing at making roblox games. The only thing I can say is maybe try making youtube videos or a nice game with some help with people that can be interesting to people. I honestly don't really have anything else to say but you just gotta learn yourself.