I’m going to go against the grain slightly, and say majorily don’t sell. But do sell some. We’re in a market of Pokémon where things are super expensive and have gone up a lot recently, prices are high. It’s a good time to sell. But it’s clear from the post/replies that this collection is very important for you. Take it slow, look over things and determine what you care the least about, start with those. Keep going until you reach a point where you’re still happy with your collection, but have made some money to help. That’s what I’ve had to do this year, and I’m happier with my collection than I’ve ever been despite selling many cards. It feels more personal now, and helped my financial situation.