I know the cost of an editor seems expensive to many writers, but like any profession, quality work will require expertise and time. If you are on a tight budget, there are many suitable tools out there to proof read and even copy edit (Grammarly, ProWritingAid, etc). I would use one of those to clean a novel up initially.
After this, money could be focused on hiring an editor that can look for plot holes, pacing, and character development issues, and also provide suggestions on improving your work. If that's still not in the budget, I would suggest find some Beta readers with those skills.
Once you deal with their feedback, you could start sending to agents and/or publishers. Or self publish, if that's your route.
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