Alright, after owning/collecting for over 40 years (I remember when I was four, we moved to a new house and I had a bag of smurfs, about 20-30, which turned into 100 which turned into I honestly don't know how many) I sold everything a week ago. The last decade or so everything had been in storage, out of the way; I had no room to display anything properly, and was only adding a new handful or so every year but that was it.
Now my kids each got to pick out one and the rest is all gone. I have to say, it feels pretty OK. I am currently in the process of moving my parents (who are now moving out of that house I mentioned in the beginning) and the sheer amount of stuff they have in there is shocking (even to them!), and at least 80-85% must go because they're moving to something much smaller. And there's so much that was there just because it was there, it hadn't been seen or used in decades. It helped me to look at my own stuff a bit more critically.
I hope y'all are getting more out of your collections than I was, at the end!