A place to ask questions of Lemmygrad's best and brightest
A lot of the time "down" for me is extreme anxiety and my answer to that without abusing substances has been Rocket League 
It's a nice mental alchemy that turns anxiety into frustration and the target becomes some jerk who yelled at me for not touching the ball perfectly. Then I get to feel competent within my own skin for a minute or two here and there.
Weed
+2 on weed. Smoke, watch funny or interesting videos, sleep and try again tomorrow
I watch old pokemon youtube videos from like 2009. Lueroi and SuperSkarmory mostly, takes me back to simpler times.
When it is very heavy, I ride my electric bike as far as possible. The farthest is 90 KM. After I told about it, one of my friends said that if he were my parents he would scold me for doing that and his words made me smile.
I watch concerts from bands I like on YouTube.
Consider going outside preferably with nice weather and some chill nature vibes, which for me would also include a bike ride. Otherwise consider doing something creative or playful, I might play on an instrument or just finger drum or sketch, etc. Just release something from yourself into the world creatively. Or consider getting some rest and slow down and just relax with some comfort vibes.
Quick fix? watch the video where the fascist zioinst kicks the rigged Palestinian flag and get blown the fuck up.