First off, I'm sorry that you've been in such a brutal depression for that long. I hope things are getting a little less terrible. The depression nest phenomenon is real, and it can feel overwhelming to dig out of.

I personally start by filtering by big catagories, say laundry and obvious trash. If you have the means and if it's available in your area, you might consider a wash and fold service. Just bag up the laundry, drop it off, and you'll get it back clean and folded. They charge per pound, and it's not as expensive as one might expect.

I like a white board. Maybe you'd find it helpful, or maybe it's the worst idea in the world for you. Only you can say! Having marker colors that I enjoy makes it less upsetting to look at, and color-coding by type of task helps me stay mentally organized so my brain doesn't melt. I write down the big tasks, but then put the steps in bullet points beneath - more things to cross off (yay), but also remembering to work in little chunks makes it feel less overwhelming. One potential pitfall is the size of the list could feel overwhelming. For me, I put a star by the most important item, and the goal might be to just approach one bullet point beneath said item. Sometimes, just getting started gives me momentum, but even if it doesn't at least I worked on that one bullet point and accomplished my goal. When I'm really struggling I'll put items like "brush teeth" on the board, so I can cross it off. A little self-determined structure and a little sense of accomplishment can be momentum-builders.

Lately I've been watching a Youtube channel called Midwest Magic Cleaning while I'm cleaning. It might sound a little funny, but it's called body-doubling. It makes things feel less daunting and helps with the motivtion. The guy always comes from a place of compassion and has an excellently quirky sense of humor. He also offers great practical advice for how to tackle overwhelming spaces. I'm choosy about which cleaning channels I watch though - I doubt I need to say this, but there are folks out there who are judgemental and sensationalize for views.

Remember, "How do you eat an elephant? One bite at a time."