Having new things makes it easier to part with older stuff, and having your Christmas decorations still up makes it super simple to see what you don’t use regularly.
The Christmas decoration storage bins are probably still sitting in the garage, so take the time to go through them before packing the rest of the holiday decorations away.
Any time you declutter and get rid of stuff that’s normally stored in some kind of container, look for opportunities to combine and downsize your actual storage containers.