Uber - take a look at Dr Kwon’s video link that Pratoman just posted:
https://youtu.be/-rvvq0udaeeThis should give you a better idea of where the current thinking is after surgery and radiation.
I would let PSA rise a little more to be sure where it is heading and obtain a PSMA scan to see if the cause can be located. Treatment options are a guessing game without scans and data. There is a time and place for chemo which Dr. Kwon explains well.