AuDHD and being a hoarder - how to fix my life up?

I'm finally admitting to myself that I think I have a hoarding problem and I feel like this community might actually get it.

700+ books half unread and still buying more. Mugs and tumblers I never wash. Decor, kitsch, necklaces, skincare doubles, fidget toys, craft supplies for like six hobbies I never actually started, binders, cables - you name it - you get it. Half my living room is stacked cardboard. My bedroom floor is buried.

I've been decluttering for months with planning help from friends, body doubling, to do lists and intelligence - and I do make progress. But I keep buying things to fill the gaps. I can't let go of stuff that's still good. Nothing feels sustainable. Even though I work so hard every single day I barely see a difference.

I know I can partly 'blame' the AuDHD, not letting go of things, hyperfocus, dopamine kick while shopping. I know having depression and cPTSD also adds to it and can explain a lot but in the end its all the same.

I'm living in a mess I feel I cant escape.

Did anyone here manage to actually change this long term? Not just a big declutter session (on it for literall months now) but genuinely keeping it manageable? What helped - therapy (I am in therapy but mainly for trauma), systems (apps, boards, gadgets), accountability (I do body double all day long but idk if I need more?), something else entirely?

I'm so tired of living like this and I really want it to be different..