Yeah, it's definitely a problem >.< And I tend to grow temporarily bored with stuff if I don't have other stuff to work on as well. Even with 1 month long jams, I can still struggle to focus on just 1 thing for the whole month. As mad as it might've been trying to do 2 games for this year's Spooktober jam, in some ways, it did actually help me finish both by being able to work on them both at once because it meant I didn't get the opportunity to grow bored or or lose motivation for either one :3
It helps a lot to be able to juggle a few different things to switch between, but at the same time, it is frustrating to make little bits of progress on multiple things that look like you've not achieved much compared to lots of progress on one thing >.<
Hope you get to have happy holidays and a super happy new year :3