Sometimes in the course of a project we learn all we can or do all we want... I believe in consistency so try to do all of one stage of a process at a time, since I mostly make bed sized quilts that can be a lot of seams. When I was making my storm at sea a number of years ago, I put on all of the skinny triangles to the big diamonds the wrong way. Picked it all out and did it all again -- including putting them on wrong a second time! LOL I keep reminding myself as I correct things that the other option is to not make the mistake in the first place so learn by how much I hate taking things apart to do it the right way next time.
But sadly, my vision issues are making it harder and harder to see seams. It is not worth my time at this point to take apart an existing project. It might, however, be a very good time to start over!
Keep in mind that most masterpieces are not made the first time... painters may make multiple copies of a painting until they get just the right one. Photographers take thousands of off shots just to get the one good shot.
I would say donate it. Someone with a vision maybe able to do something with it. That might include cutting it up or quilting that plays up to the strengths or in other ways. But my advice is you learned that you want more contrast and life is short so move on to a fresh start
