https://twitter.com/visakanv wisdom: focus on what you want
Beginner writing advice: write down everything going through your head without censoring or editing for the next 20-30 minutes and just get it out no matter how crude, jumbled, disorganized, hateful, etc it is. You can only write after everything that is stuck in your head is cleared up.
General talk-therapy advice: write down 1 positive thing you did in the last 24 hours