I suggest you regularly going for a walk (at least 30 minutes), in an area with plenty of greenery. Perhaps a park. The change of scene (from being inside) plus the exercise, sunshine and face to face contact with others should help.

When you're at home, play music regularly and often. https://www.gethealthystayhealthy.com/en-au/articles/10-heal...

While listening to your music a little DARK chocolate may also help. https://healthyeating.sfgate.com/dark-chocolate-serotonin-le...