After watching a fairly convincing Youtube video from Kurzgesagt, I've been trying daily gratitude journaling (separate from the psuedo-CBT journaling I do to manage anxiety), as a tool to keep ahead of depression.

Honestly haven't noticed any effects one way or the other, but I realized this morning that dancing, even for just a minute or two, provides a large and immediate boost to my outlook.

Here's Believer by American Authors. Give it a try.