You think you will use it again. Well if it is gone you have to choose a new pattern to try.
I keep three or four go to patterns for fast piecing and that I like to make for when I need something fast. TATW, Ohio Star, Drunkards path and the simple 9P. These can be made in any size and I change them up by doing different borders on them so they are always 'new'.
Then there are the three huge binders filled with inspiration quilt patterns that I love to browse through to find some new technique or pattern to make. I will never make them all but I'm giving it a try!
If you really haven't used them for a while, why not replace them with something new!!!
peace