Do you have any DIY ideas for plastic hangers?
Here's something I saw on Pinterest. Maybe that will give you some ideas.
Here are some ideas for you: https://www.onlyhangers.com/home-organization/2017/08/13-amazing-ways-to-create-craft-with-plastic-hangers/
Pinterest has lots of hanger ideas: https://www.pinterest.com/tickledpinktony/hangers-upcycle-reuse-recycle-repurpose-diy/?lp=true
This is pretty cool! A cube hanging light made out of hangers. https://crafts.tutsplus.com/tutorials/make-an-amazing-cube-lamp-with-24-humble-clothes-hangers--craft-2956
If you really have more than you need, take them to any college or school where students live in residence. Dorm rooms are always short of hangers. Cash-strapped students will put them to good use.