This is my forth game jam. I've done the Polymars sea-jam, 2023.1 Brackeys and the 2023 GMTK.
I was very productive on days 1-3 but after that point I slowed down each day. Until the final day, which left me with barely any motivation. That is one reason why if you look on my game's page, it says it was submitted 12 hours before the game ended. That, and it was 10 PM my time, when I finally submitted it. It is basically the definition of minimum viable product.
Here's the page BTW: https://itch.io/jam/brackeys-11/rate/2522191
About dropping projects, I used to be guilty of this. What made me stop was having others join my team. It really helped me. Just bouncing ideas off each other really helps. Now me and my team are about to be done with our first public demo!
I would share the page for that game too, But I don't have one for the public yet!