Don’t think of rewriting as needing to suddenly make a story perfect, particularly when going from the first draft to the second. You can keep entire chunks of text from a previous version. You can make notes in your second draft, or your third, or your fourth. It’s okay to note that a line is awkward and then move on, or to make a note that you need to add a scene but not write it yet. Writing is a process, and you don’t need to get it all in one try.
This is, in fact, usually better for your manuscript in the long term.
Each draft should be focused around correcting certain things, specific plot lines or character arcs or relationships, descriptions or dialogue, actions or emotions, etc.
If you try to fix too many aspects during a single draft, you’ll run the risk of overwhelming yourself and/or making mistakes you could have avoided by limiting your focus.