I've never struggled with hoarding, just my home being a mess. For me, it was because I'm obsessed with organization, and if I can't do it perfectly then I don't do it at all. So with depression comes the lack of energy, therefore my home looked like it exploded.

I was talking to an ex-T about it. I told her putting away clean clothes was the worst for me. She asked me about it. I explained I organized my clothes by type (dresses > sweaters > long sleeve shirts > short sleeve shirts > sleeveless > sweats > pants > shorts > skirts). Within each type, I organized it by color (thankfully I have always owned 90% black clothes). And btw, my clothes are still organized like that The problem was that each type of clothes has a specific color hanger assigned to it. If I ran out of a specific color, I'd have to reorganize everything. My T simply looked at me and asked: "why don't you just use the same color of hangers for everything?" It actually helped me a ton! Lol. Now, so long as I have energy, putting clothes away is easier.

Maybe you're T has some ideas to help you even if s/he doesn't specialize in hoarding?

Added note: I used to watch hoarders to motivate me to clean my house