Hey! I know how you feel. The time limit on game jams can feel overwhelming, especially when you are pushing the envelope of what you are capable of. This is basically scope creep.
First, don't give up! your game doesn't have to be the best game ever. we're not competing, we are just trying to get better together!
Second, try to limit the new things to try to 1-2 things for a game jam. if you have time try others.
Third, this is something I started doing, but you can do even at this point to help re-evaluate. Make a list of all the features you want in your game. Then make a list of the subset of those feature which are core to the gameplay loop. Then, make a final third list of the non-essentials in order of which you want to implement the most. then you knock out the essentials and make an MVP, and start adding the non-essentials until you run out of time.