Heeja,
No idea whether this works for everyone, but it does work for me. Whenever I can, I try to figure out new ways to do "good", and do them. Very small things, like taking care for some plants (don't have pets), recycle your plastic coffee cup at work, get something to drink for the rest, etc. When I feel down, those things are harder, but not impossible. And it does have a calming effect. Maybe that will work for some of you too.
Genuinely trying to help others, whether they are human or not, brings a much deeper sort of happiness, more like a calm. At least, with me. And it helps a lot with stopping thoughts of being useless as well.
There are a million things you can do, and I am very curious whether you do something to help the world, and what it is. Can you please share them with me?
Maybe we can make a list or something with easy things to do when inspiration fails you (which tends to happen a lot with me).
Thanks in advance, and have a wonderful day!
Erik