I work in real estate and various house estate sales. In regards to collections and "valuables," I often hear people say "I'm going to give it to my kids when I die" or something to that extent. I will tell you this: Your kids or close family will not care about your guitar collection nor 99% of the stuff you thought was valuable or sentimental. They don't have the time or energy to get top dollar from it online. They don't know the market or the slightest clue how to sell guitars. The best they can do with your collection is give it to Guitar Center for chump change. To them, it's a nuisance and problem to solve. This relates to 99% of collections from what I've seen.
Sell your collection online to someone who actually wants it. Yes, you don't know this person. They aren't your kids. Who cares - they want it. Let them have it. Keep a few guitars/amps and call it a day. We all have release our gear back into the wild at some point. Because, you know, we will die and pieces of wood/metal can surely outlive us. If you want, keep trying out new things - just sell something before you buy. It's psychologically difficult because we spend so much time searching and researching the things we want, but I promise you it will be a relief once you downsize.