Hello, we don't have any kind of paid promotion if that's what you're asking. The best way to organically promote your game is to get more people to play it from your existing audience, and have them rate or comment on it. More activity on your projects' pages can help them rise up more in our various pages, which can then help your game get discovered by more.
There's a lot of competition for views on itch.io's internal browse pages though, so finding ways to get relationship with game reviewers or players can help out a lot.
Also, make sure you put together a nice page that shows off your game and is correctly classified to make sure that when people do go looking for your game there's nothing that gets in the way. If someone lands on a page that doesn't do a good job of showing off the game's best parts, then they might bounce and look for something else.