I have been going through boxes since I just moved. I have been sorting and if something just doesn't work any more, it goes into a donate pile.
Even though my new home has more space, I want less stuff. I will slowly go through everything and organize or toss. We did get rid of a lot but there is always more isn't there?
I too have ADHD and this is hard but I know it is a process so I expect now to have these projects more or less ongoing with breaks so there is no burn out.
One motivation is I won't allow myself to buy any new clothes until I go through my wardrobe strategically. This will certainly get me focused soon.
Good job of passing on the carousel horse, it sounds like it wasn't ever going to be near the top of your list. Keep at it. It is hard to move but worth the work done beforehand.