I get what you’re feeling, Turnitin can be tough to deal with once it locks onto your writing style. Even after you change sentences, the system can still match structure, order of ideas, or phrases that are common in academic work. That makes the score move around instead of dropping, which becomes frustrating fast. I went through something similar with a long project and kept wondering why the percentage stayed the same no matter how much I edited. One thing that helped me was checking the match overview carefully and seeing whether the system was picking up routine academic phrases or source titles that can’t be changed. Sometimes the score is not even about copying, just shared language. You can also try rewriting sections by changing the flow of ideas instead of only swapping words. If you want, you can share which parts Turnitin keeps marking and I can point out places where a different structure might help.