Sometimes you’ll make art you like and will want to keep it and other times you’ll instantly want to throw it in the bin. It’s okay to feel that way but before you do throw anything out, consider using the rejected art as a starting point for new art.
Having a pile of rejected bin can be a helpful source to mine from. Why not use the art as a background, cut it up, tear bits off. draw over or reassemble to make something new. You don’t have to start with something ‘good’ to make something interesting. The fact the binned art was initially rejected may help lower your expectations to make anything ‘good’ and instead make unexpected art for the fun of it.