It takes me a long time before I give up on something sentimental. But, last year I donated many things from my linen closet to flood victims. They were old quilts, new comforter sets, embroidered sheets and pillowcases from my mom, and twin sets from when I had twin spare room beds. The stored linens didn't fit my beds , but, I had saved them anyway. I offered them to other family members and they declined. Now these weren't used, they were new. I finally just told myself it was time I didn't need to save them any more. And, most importantly, these people would love and use them.
I had a wonderful feeling from sharing those items and cleared out other clothing, coats and household items. How liberating!