Self-learning wing-foiling (when you're on the lake, being 6 feet from someone means dangerously close to a collision, so "social distancing" is natural...), kinda as an excuse to spend some time outside, move, generate endorphins and not think about other things (winds at my place are usually nothing to write home about, so actual foiling happened just a couple days).

Also some trekking and reddit's r/bodyweightfitness "recommended routine" ~once a week.

Those things didn't "always work" to lift my mood, to make it clear, but there were notably many times when they did. Esp. wingfoiling in the summer :)