Cut the throat-clearing
Machine drafts open by restating the question and close by summarising what was just said. Both can usually be deleted outright without losing information.
Phrases like "in today's fast-paced world", "it is important to note" and "in conclusion" carry no content. Remove them and the paragraph gets stronger.
Replace generality with specifics
Generic drafts say "significant improvements". Useful writing says "cut the export step from four minutes to forty seconds".
Go through the draft and mark every unquantified claim. Either supply the number or delete the claim. This single pass does more than any other.
Break the rhythm
Machine prose tends toward sentences of similar length and paragraphs of similar shape. Vary them deliberately: a short sentence after two long ones changes the pace.
Watch for the three-item list appearing in every paragraph. Sometimes two items is the honest answer.
Verify everything checkable
Names, dates, figures, quotes and technical claims must be checked against a source. Fluent text is not evidence of accuracy.
If the draft cites something, confirm the citation exists and says what the draft claims. This is the most common failure and the most damaging.
Add what only you know
The part a model cannot supply is your own experience: what went wrong last time, what the client actually asked for, what the constraint really was.
A paragraph of genuine first-hand detail is worth more than a page of correct generalities.