Almost anyone who does any craft work at all creates what the Americans call a stash. This stash can result in a disposal problem when your interests change. I would recommend passing on things you really can't see yourself using in say the next 5 years (and I'm being generous in giving you 5 years!!!). Where to and what are we talking about? It rather depends on the craft but here are some ideas for what you might have and where to donate it.
1. Knitting Yarn
Much of this will be wanted for the army of knitter who knit for charity. Every year thousands of shoe boxes of Christmas presents are sent out by Samaritan's Purse under the heading Operation Christmas Child and many knitted items are included. A church or school near to you is sure to be taking part and would welcome donated yarn.
I could post a dozen or more links but here is a collection of them. One of these is sure to appeal to you and want your yarn stash.
to be continued....