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...
Hey dude, hope you're doing okay. Lately, I've been telling myself that there are times when just staying alive is enough, and I think that's what you need right now. There are a lot of different ways we hate on ourselves, but always try to remember, you lived, and you survived the day. Try not to think of surviving as doing nothing, you're always doing something for every moment you're on Earth.
I know you mentioned this, but just remember that times are hard for everyone right now since most of us are sheltering in place, so you're not alone there. I had always hoped that the internet would be a great resource for people like us, but I do agree with you, forums and crisis hotlines can only go so far. I don't think there's really much else we can do with the internet.