One thing that helps is focusing on how this improves your life.

Even if all your writing does is clarify things in your head, that's progress. You are better because of it. Don't bother iterating and polishing the writing if you don't feel like it. Move to another post or write on the same subject again with a clear head.

Also, do not underestimate the quality of your work. It is often good enough for people who are not at your level.

There is so much work out there I now think is mediocre but used to believe was amazing/awesome/life-changing.

Making personal progress is more important than doing nothing and stagnating.

Good luck with your work ;-)