I agree with the others about donating to guilds or church groups, not to thrift stores where fabrics are not understood or appreciated (and are sometimes thrown out). Definitely get rid of any fabrics of lower quality, or that you've lost interest in. Keep tools that you actually use, not the ones that have been in the original packaging for years. (I'm sure we all have some of those - I know I do!) And don't forget that you can have a sale and get back some of the money you've spent on your hobby.