I believe the best motivator for getting rid of junk is when you move homes cos in the process of packing, you will uncover things you never knew you had and it can be quite cathartic to get rid of it.
We try to go through our wardrobe yearly and donate the clothes that we do not use much. Helps to prevent the wardrobes from bursting....lol
We moved a couple years ago and "should" have done this - but there was a major rush due to moving the weekend lockdowns started here, so we had to smash it out. just piled crap into a van and drove as fast as possible :D
We do the same with the clothes, though I tend not to have too much I want to throw away - while my wife might have clothes still with tags on...
Similar situation for me. We moved just when there was a couple of weeks window between the lockdowns in Victoria. We had to clear lots of stuff to de-clutter, but sadly now we are almost filled to the brim again....lol.
That's the problem with having more space. The more space we have, the more junk we keep to fill up the space. It's like a game of Tetris, always trying to fill that gap :)