Stagnation is a tricky one to deal with for sure because it can manifest itself in a lot of different ways.
I tend to bite off more than I can chew regularly and one of the things I’ve realized just in the last year or so, is that it’s important to break things down. Trying to accomplish the whole thing at once mentally is difficult. If you can break it down into smaller components and then tackle each one like that it’s more effective. That’s not always easy either but you gain skill in breaking them down each time you do it.