The only thing that has worked passably well for me is the scoop shovel. Purge without looking too closely at what is going away. I end up longing for a few things once in a while, but if I can't find them when I need them, what's the point of having them in the first place? A few weeks ago, I filled a dumpster with seeds from old plant-breeding projects. It felt sad, and wonderful! A feeling of impending freedom.
When my greenhouse got crushed recently, I razed it to the ground, and discarded all of the associated equipment. It felt super liberating.
I finally got my clothing under control. All of my summer clothing will fit into one backpack. Winter clothes are bulkier, but don't take up much more space than that. And mending either gets done today, or the item gets discarded. No piles of things waiting to be mended. And those colors and styles that I wouldn't ever wear? They gotta go! Doesn't matter who gave them to me, or what peer-pressure is involved, or what fantasies I entertain about that party that I'm never going to attend.
I find it much easier to not bring stuff into my space than to get rid of something once it's here.
I'm getting pretty good at letting go of things that are sentimental only. Stuff that belonged to my grandparents, trinkets from grade school, etc... My grandparents are long dead. I don't receive joy from my high school yearbook.
I'm floor-sleeping these days. Can't stash anything under the bed. Inconvenient to put things on my bedroll.
I'm getting pretty good at not accepting the "Sunk Cost Fallacy" which is "I paid money for this, therefore I can't get rid of it". A variation is, "I could sell this for $10, therefore, I have to hold onto it until I get around (never) to selling it." Best to consider that the price was paid in full with the joy of bringing it home.
If it doesn't bring me joy, right now today, I'll often get rid of it.
All those things that I'm saving because I might fix them some day? Nope, gotta go. I'm never going to fix them, even if I already bought the replacement parts.
Oh, and the rest of the family are hoarders too? I intend to only deal with my own hoarding, not with anyone else's.