Tapered from 1mg to.. 25 Xanax (alprazolam) over 6months. Do I need to taper more or can I quit.

Good job. You'v done nicely with slow taper. I would continue tapering to decrease risk of withdrawal or rebound symptoms.
Xanax (alprazolam) taper. You can try half the daily dose for a week, then quarter for another week, then discontinue. You have done well so far.