The easiest and fastest way to purge kids stuff is to have them involved.
Way too many stuffies is a common problem when dealing with getting kids spaces organized. It can be a health issue if kids have allergies and have too many stuffies. Our pediatrican recommended our twins have only 2 stuffies in their bed at night given they suffered from asthma. Often kids have too many of them because, it's the parents who are sentimentally attached to certain stuffies.
Secret sauce to paring down stuffies by 50%
Sit down with your child and have all the stuff is gathered together in one pile.
Then pick up 2 Stuffies and ask your child to choose the stuffie they like the best.
You will than be making two piles - one for stuffy's to keep and another for stuffy's to donate or pass on.
You will notice they are very clear about what they want.
Talk to them about them being generous but passing on stuffies to kids that can love and need the stuffies.
Keep it light and have a fun activity to move on to once you are done.
It's best to put the stuffies to be passed on into a bag when they are occupied by the next activity and get them out of view.
It's a simple and easy as that. If there is any issue with the process move on to something else so it's not a forced process or offer a reward for completing the process.
Do yourself a favour and pull back on purchasing stuffies and practice the one in one out rule.