I think a lot of the sarcastic comments about "have you tried not being depressed" (there's one in this comment section) are actually making things worse because I think that trying to get over it is one of the required parts of functioning despite it. Sure, it's easier said than done, but if you just accept that you're depressed and that means it's not worth it to try to get out of bed because you don't feel motivated, it starts to become a self-fulfilling prophecy.

Your attitude about your mental health issues can IMO drastically affect the outcome (or outcomes, since each day, each activity done, delayed, or abandoned, is an outcome).

Though nutrition can also play a huge role, which can compound because mental health issues can make it harder to get proper nutrition. Supplements have made a big difference in my life, just taking them on an "as needed" basis (and combined with a bunch of research on symptoms of various nutrient deficiencies). For me personally, I've been able to get out of "I don't feel like doing anything right now" funks with vitamin b-complex and sometimes magnesium. This obviously won't work for anyone whose issues aren't related to nutrient deficiencies, but if you find yourself struggling with motivation, it's worth a try, at least. Those two also seemed to help with my (mild) long covid, or at least the exhaustion part. There's a lot of overlap between mental health symptoms and vitamin b deficiencies symptoms.