Well I'm still not sure if I will join since I do have school during the week of the jam. For now I will not join a team but if you want to add me on discord (vador27) I'll be happy to help you with some part of your game during the jam.
I have some experience with Unity but I am focusing on Godot right now. If you think that you will need my help, tell me some time before the jam starts and I'll re-download Unity.
Edit : Since you're looking for a game designer. You can also send me a message and I can help you with that (Making map layouts, game mechanics and lore / a story for the game...)