If I were you, I would keep the drafts.
It's alright if you don't want to, mine physically hurt when I reread them, Why not come back to it weeks, or months later? It's a good opportunity to analyse why the chapter(s) didn't sit right with you. Was it the wording, the pacing, the structure, the story, something else?
It's fine to scrap writing, heck sometimes it's needed to continue on the right track, but you can always recycle & learn from your past attempts and that itself is pretty reassuring. It's good to keep the HOLY TRINITY of Goals, Obstacles and Stakes in mind, too.