First the caveat that I’ve switched to mostly running and my real priorities are overall health, fitness, and maintaining strength.
I find three runs a week plenty and that ends up being at least one “hard” workout. I try to do two sessions per week of strength training. Usually it functions as zone 2 cross training as well by swapping through exercises to keep my HR in roughly that zone. My strength training has a focus on support for running.
So yeah, I’ve basically swapped some zone 2 cycling and/or running for strength training. Realistically I’ve swapped some cycling because it’s hard for me to recover adequately from more than three runs per week. Cycling is much easier to do on consecutive days. Cycling is also great to do the day after a run because it works the body differently and gives my feet a rest.
Otto