My best advice, Start throwing **** away today and do it often.
When we rented my wife would be like "That's cute but I don't really need it". Something changed after we bought a home. It's like she got her own personal vault that she seems to think is infinite in size. Now she'll come home and say "Look what I found at a yard sale, it was only a dollar. Isn't it cute?" I'll say "yeah, that's interesting. I like it." but in my head I'm thinking "I guess I'll put it in the attic. I wonder how long it will be until I am allowed to take it to the DI."
What's worse is that as much as it drives me nuts, I find myself doing it! A couple of years ago there was a solar eclipse. I made a solar viewer out of a cardboard tube and duct tape. It's still in my attic. smh