If you’re moving, then set some firm boundaries: You will have 1 moving truck (or whatever you’re using) - if it won’t fit in the truck, you can’t keep it, full stop. If there’s something that won’t fit that you absolutely must keep, you’ve got to remove something else to make room for it.

Take it one room at a time, or even one quarter of a room at a time. Don’t cherry pick things to remove - just start at one end and remove everything. It either goes in the dumpster, or it goes in the truck, but it can’t stay in the house, and you’ve got to choose one. There’s no “We’ll decide on this later”.