Pack it up neatly in gallon Ziplock bags, mark it 100% cotton quilting fabric, and donate it to a local thrift shop. I had been given a bunch of fabric that I would never use, and it was just taking up space. Assistance League, of which I am a member, runs thrift shops, so that's what I did. It sold immediately, especially these days when so many are making masks.
Don't keep it laying around thinking that some day you'll use it. You will just feel guilty.