◇ Could this help me?
Yes, with a warning about the middle step. The first and third fixes are both right and the third is by far the most valuable, because banning tells only removes what makes writing sound generated, while a voice file built from your actual writing gives it something to sound like instead. The middle step is where this can go wrong: many humanizer tools work by substitution, swapping every em dash for a comma and every banned phrase for a synonym, and mechanical substitution reads worse than the original because it turns joined clauses and list labels into run-on sentences. The fix is to have the writing produced correctly rather than corrected afterwards, which means putting the constraint in the instructions up front. General practice.
Read the samples of my own writing below and build a voice file that captures how I actually write: sentence length and rhythm, the punctuation I favor and avoid, my vocabulary, how formal I am, how I open and close, and the constructions I never use. Be specific and quote examples rather than describing my style in adjectives. Then write the file so that future drafts are produced in that voice from the start rather than written generically and corrected afterwards, and include an explicit list of constructions to avoid, with the punctuation each sentence should use instead so nothing gets swapped mechanically.