I'm not sure to what degree I'd trust a student or random online gig worker to give a really useful editorial option. Copy-editing or maybe technical edit? Possibly. I used an intern who worked for a magazine editor I knew to copyedit a book once and that worked fine. But I wasn't looking for substantive structural work. In fairness, I didn't really get that when I went through a publisher either. The second edition was IMO a lot better but that was because I personally came to see where the first edition was stronger and weaker.
The idea would be to get feedback from someone who isn’t partial to you and who hopefully has an eye for decent writing. You wouldn’t take what they say as gospel but it’d be enlightening.
It’s like letting someone tech savvy but not partial try the UI/UX of an app. They’ll see things you don’t and get confused in places you don’t.
