When I get down to serious editing, I actually don't edit the manuscript. I rewrite it. Kind of like Rick's version above only taken to the extreme. Since I use Microsoft 365, I open the original document and a fresh blank. I slap the finished to the right pane, the blank to the left and I start all over. I read from the original and type it into the blank document. Only now, I can see all the little mistakes I've made (my big hangups that drive me nuts are thing/think, and adding an 'e' at the end of 'th' words). This lets me see the story that I wrote from the perspective of knowing the exact ending, the exact journey to get there, and the exact character changes that go on. Not only can I tighten up my dialogue, description, and text, I can add more foreshadowing and other tools that will enrich the story. And instead of reading and typing and backspacing and slapping myself in the head, I just write the story anew, with a great template to guide me.
I don't know if that will help but it helps me a lot.