You can pick a game jam with a name that you like from the game jam calendar.
Then read the rules to make sure what kind of contributions are accepted. Sometimes it’s any sort of media, sometimes it’s only pixel drawing or something very specific. More often it’s video XOR physical games.
The “physical games” crowd on itch.io is pretty open to blurring lines between board games and ttrpg. The strongest divide you’ll find is videonormativity.
Anyway, even if you don’t submit a game in the end, joining a jam let’s you find a lot of games. And if you make a game, you can update it very easily. So just try.