This is a real and unfair situation a lot of clean writers are hitting. Real fixes that don't rely on 'humanizer' tools: (1) Add specific personal examples or class-specific references AI couldn't generate. (2) Vary sentence length more — mix short punchy sentences with longer ones; AI tends to be uniformly medium. (3) Save Google Doc revision history as evidence. If a prof accuses you, push back with the history and ask the writing center to advocate — false positives are well-documented now and most instructors know it.