Most of us are attached to most of our stash.
1. You could try to separate the fabric and patterns that you could part with, and keep the rest.
2. Separate the lesser quality from that pile, give to local thrift store.
3. Then I would have a quilter's yard sale. Advertise it as such, in local papers. "Attention Quilter's", fabric, books, etc. Stash priced to sell., or something like that. Put a 3-4 hour time on it.
4. Have 2 or 3 friends help - if they are quilter's give them first choice of the sale.
Enjoy the "joy" you will feel from other quilter's at your sale.