When you aren't sure you're really ready to get rid of some things, seal them up in a box and write on the top, side and end of the box (so you can read it in a stack of boxes)
Re-evaluate on [the date 6 months from today]
Don't write what's in the box. When you go to open it, you may find it useful to discover things you'd totally put from your mind.
Maybe they just needed time off from use, but often you'll find that now you're really ready to send them on to a new home.
This can be a great thing to do with kids. Either the toy is now forgotten and boring or it's almost like a new toy. Either way is a win!