I wish I had advice for you. All I can do is commiserate. Just finishing cleaning out my father's house. It will be sold soon. The house doesn't present a problem but the stuff in it does.
People are important to me. I have never had many - moved too often. And then there are the family members I never knew in person but know well from stories from other family members. There are "things" that I don't "use" but still give me pleasure. And those things attach to people.
My father's stuffed animals is a case in point. His great aunts (7 of the ladies) could create the most intriguing critters using their sewing and handwork skills. The critters are works of art and have lasted through a little boy and lots of wandering around the USA. They are not just old toys to me. They are connections; them to me and me to them.
Lots of decisions and things to do before someone empties my house.