OP, I get the overwhelm!
I’m the same in that I was brought up not to be wasteful so only things that are broken beyond fixing get recycled, broken into recyclable components. If someone can use it, it doesn’t go in the bin!
I also try to encourage my DC to tidy by not doing it for them, but that just means it’s always cluttered. DH doesn’t tidy anything away and has no problem leaving his shoes in the middle of the hall. It’s infuriating.
I get a sort of paralysis trying to deal with it because I see the task as Tidy The House (which is impossible), rather than Tidy This Section of This Room. I then get in a fankle because it’s something else I have failed at doing (also a perfectionist 🙋🏻♀️) so go and do something I can achieve and get distracted.
What I’ve found works is having specific places to put things. When DCs get in from school they put their shoes in the drawer, hang their coats up on their pegs, packed lunch boxes go next to the sink and bag goes on peg. Every day, without fail. No screens etc until it’s done. Get baskets (something fancy!) to dump stuff in so it at least looks nice until it’s sorted. Everyone can have their own basket. DH has to stop adding to your list. Mine thinks nothing of leaving opened envelopes etc on the side rather than putting them in the bin as he sees it as “the kitchen is a mess so why should I put this in the bin, nobody else does?”. He’s a twat. Same with tumble drier fluff. Instead of thinking “I’ll do a little bit” he’s adding to the overwhelm. Your DH also has to live in the house with all the stuff that is driving him mad that you have effectively banned him from dealing with. Get him to help. Part of the process of de-cluttering is disposing of things so there will be some boxes you can whizz through that can just go. Tell him which ones and get him to take them to the dump/charity shop etc. Once he’s been shown which ones he can deal with, they are no longer your responsibility. If he doesn’t do it then that’s on him, it is no longer your problem.
Work out how you are going to get rid of things. Charity shop (you may have a larger, drive-up one you can take a car load to), clothes collection people (£/kg places), FB (give yourself a time limit before it gets taken to the tip), Vinted etc. Small batches of stuff at a time. There will be free stuff FB groups and someone always wants a picture frame/grater/set of mugs.
You are not responsible for solving poverty. The value of the contents of your house will not solve poverty. Stop keeping things to help other people. Put yourself first. Once your house is sorted then you can get back to worrying about them!
If you’ve just moved in, you can use it as a blank canvass to get all your organisation/specific places for specific items put in place from the start so you’ve got good foundations. It’s a continuous battle that you can stay on top of rather than conquer. You’ll never have an Insta tie house (those people aren’t real!) but you can have a nice house that doesn’t take too long to make it look lovely.
Ignore the “JUST THROW THINGS OUT!” Brigade. They don’t get it.