The main solution to writer's block for me seems to be tricking my brain into thinking what I'm writing isn't important. Usually what's blocking me is my own perfectionism and the pressure to perform, so I find ways to fool myself into writing Other Things that are not The Thing that I'm currently trying to work on. I wrote about some of the specific ways I do this here: https://lauratoddcarns.medium.com/8-quick-tips-for-battling-writers-block-de3730820fa