If your cancer is hormone sensitive, then ADT is an option that should be pursued and it sucks to suggest to do this long term, but the other option is ??? If the cancer is hormone resistant, there is a suite of other drugs to explore. Because you have been on this road for a while, whether or not to explore couplet/triplet therapy that includes chemotherapy is definitely a conversation to have with the medical team.

In terms of the "10 isn't many", my team talks to me in the same manner, they just won't talk beyond 10 years, so in that regard, feel good that you are part of this "maximum outlook"!

Your PSA levels are low, surprised the PSMA PET found a couple spots, unfortunate in that regard, but good to know where it is, because it is somewhere (remember, PSMA PET is 85%/90% capable of finding cancer, some variants of PCA don't work with PSMA).

My laymen thoughts, go with ADT, and check PSA every six weeks. If you can manage ADT and PSA remains less than 0.1, then you are good to go. Just keep biking, that is terrific to clock those miles per week!