It would be useful to know what your diagnosis is.
Your treatment would be Watchful Waiting, not Active Surveillance. Active Surveillance is not something you can stay on if you need treatment to prevent progression. Watchful Waiting is what you are on if you decide not to have treatment (or can't have treatment for other reasons), but still want some monitoring and treatment of symptoms if they crop up, and the option to have treatment in the future if things change.
Something you might consider would be to go on to just Bicalutamide as a hormone therapy. That has fewer side effects then the full hormone therapies (injections or Relugolix). Also, it's bone strengthening (when used by itself) rather than bone weakening. It will also shrink your prostate, possibly removing the need for a TURP. The down side is that it doesn't work for as long as injections or Relugolix, and you probably also want to be on a low dose of Tamoxifen to prevent the Bicaluatanide causing breast gland pain/sensitivity and growth.
It would be nice if Enzalutamide, Darolutamide, and Apalutamide could be made available by themselves. Enzalutamide has been trialed and works well, the others haven't been trialed this way yet as far as I know, but none are licenced for use in this way in the UK. They would work for much longer than Bicalutamide, and Darolutamide, being too large a molecule to pass through the blood/brain barrier, might have even fewer side effects (but might also struggle to get through the blood/prostate barrier, so that specifically would need testing). These would also need the low dose Tamoxifen.