Firstly know you are a wonderful person who is sending out positive vibes through your posts. You knowledge and advice is helping many!
I am no expert I could go down OT route but I dont' think that would benefit you currently other than trying to do things you enjoy and keeping some sort of routine. Definitely not retreating butI know this is hard with depression. Personal I have never had bad depression. After a still birth and the breakup of my relationship I was really down. I retreated and it didn't' work in fact it got worse. I found walking in nature bare foot did wonders. I think the correct term is 'Earthing' an amazing grounding tool which I still do today when any stress comes into my life. On top of this I took myself into the local woods and lit a fire, just on my own and meditated and reflected. Just letting the flames burn away my sadness I guess. Worked wonders for me might be worth a go. All the very best, love you content. Sending you Reiki vibes 💯🐒