In this interview with Tim Ferriss and Seth Godin, Seth describes how there are three types of editing: copy editing, line editing, and developmental editing.
Copy editing is reviewing a document for grammar and accuracy. This is where spellcheck in Microsoft Word shines.
Line editing is reviewing sentence-by-sentence for precision to the larger context of the document. I think of this as "is this sentence written in the best possible way?" and ways to smooth out your voice for the reader.
Developmental editing is reviewing the holistic context of the document and whether it is making a compelling argument. This is answering the question "what is the change you seek to make?" and how well are you doing that? This is about moving paragraphs or chapters around and adding or removing context to make the story resonate more with the audience.
I've found distinguishing between these three types of feedback incredibly helpful, and further, that different people are better at providing different kinds of feedback.
First, spellcheck and Grammarly are excellent tools for copy editing, and with these tools so readily accessible, it's impossible to forgive poor copy editing. However, it's worth stating that no one reads a document and changes their behaviour because the copy editing was excellent. This is table stakes. In fact, Seth describes how he hires an editor to copyedit his work prior to sending it to his publisher for further edits. I think that's a great tip to reflect on: have a tool or someone you trust copyedit your work before sending it out for more serious revision.
Second, have someone you know is an excellent line editor review your work. I work with a particular executive who is relentless for line editing, which can be good and bad, but ultimately makes every sentence in the document as strong as it can be. Great line editing reviews every statement and asks "how could this line be stronger?" and line the beams in a bridge, improves the strength of the document as a whole. Two ways to do this: have a details-oriented colleague go through your document line by line and make edits. Alternately, the tip I prefer: give yourself 24 hours between writing and editing, because these are different functions in your brain and you need the space, and then review every single line in reverse, asking the question "could this be better?"
Third and most importantly, have a mentor, peer, or trusted friend read your document and reflect back on whether it resonates. This is by far the most difficult kind of editing but is priceless in the pursuit of excellence. Having someone who can see your work for what it is striving to be, internalize that goal, and then reflect back ways to reorient your structure to be more impactful can be the difference between good and great. I've read so many books that desperately needed developmental editing: the concept is excellent, the stories are mediocre, and it drags on too long. A developmental editor will help you transform not just the sentences on the page, but the whole way you're constructing your argument.
Lastly, a few warnings.
Asking for the wrong type of feedback from the wrong type of person can be painful. Despite our best efforts, some people genuinely think highlighting the spelling mistakes and nitpicking your data will help improve your writing. It might, but in my experience, that is not the most impactful area to focus on. It seems that some people never quite overcome this hang-up, as if it is deeply rooted in their personality, so don't fall down the rabbit hole of trying to get all the details right without first understanding the context.
Humans are storytellers. As compelling as a series of strong data points connected linearly in an argument is, you want your work to resonate on an emotional level because that is where change comes from. Very seldom does cold, hard data make the change we're looking for. We all believe the stories we tell ourselves, and without that connective tissue, your argument can't hold weight.
In the words of Simon Sinek: Start with Why. In Seth Godin's words, what is the change you seek to make? In my words, what is the problem you're trying to solve? Begin there. Get the big picture right first, and then sweat the details. Don't lose the forest through the trees.