How can I get AI feedback on something I have already written?
Give the AI a narrow review job, like spotting repeated points, sentences that can be read two ways and claims that contradict each other. I'd have it point to the exact passage and say what the issue is, and leave the rewriting to you. You decide which changes to keep.
One of Teresa Carlson's personal examples was using Claude to review writing she'd already done. She described asking about repetition and contradictions, and about places where the writing could be clearer, then evaluating the suggestions herself.
A prompt along those lines could read: "Identify repeated points, sentences that could be read in more than one way and claims that conflict with each other. Show the passage and explain the issue. Do not rewrite the whole document."
Read the feedback next to your original draft. A repeated point may be unnecessary, or it may be something you stress on purpose for that audience. Shortening a sentence may read better and still drop a qualification you need. The suggestion doesn't settle it.
If you do accept a change, look at the paragraph around it. One edit can improve a sentence and weaken its link to the next.
For a first test, pick a draft with nothing in it you're prohibited from putting into the tool, and ask for a review of one section. Then decide which changes you'd make and why.