Decluttering can be hard and kind of scary. It's hard to part with things. Especially those things we have had for a long time. So try boxing up some of the items you are struggling with getting rid of. Tape up the box and then date it. Stash it away in a closet or the basement.
Six months from now if you haven't even thought about anything in that box. Donate it. Don't open it. Just donate it.