Those are all excellent ideas, yytz.
Personally when I’m feeling down I love to play guitar. Davening with a lot of kavanah also helps- focus on every word and don’t be afraid to fall behind. Sleep is also very important, as is taking a walk or exercising every day.
Recently, I’ve taken on a minhag by the arizal of making a declaration every morning to perform the mitzvah dioraisa of ve’ahavta le’reiecha Kamocha. This gets me in the right state of mind, and focused to really love my all jews i interact with, and help them out, in any way possible, be it a kind word or tzedakah.
Another good thing is to find a hobby, like learning a language, knitting, or playing an instrument to make your time more fulfilling.