The feeling of finishing a task is a really big driver for me. It also helps me know when I can stop dedicating mental resources to something and move on--which

The feeling of finishing a task is a really big driver for me. It also helps me know when I can stop dedicating mental resources to something and move on--which leads to the trap of fixating on one thing and putting a lot of effort into it. I think I will do exactly what you suggest, and pick something that's more fun to work on next, rather than what I think I "ought" to.