I've been in many game jams already both solo and with the team. People are almost always positive in game jams, this is what I love about them. The main advice about the game jams is to try something new and have fun! Simple as that. Also, it is important to keep your scope short, because there is not so much time to make a large game with plenty of mechanics. Better focus on polishing your game, so it would be nice to play for other people.
You can try our game here: https://itch.io/jam/brackeys-9/rate/1932578