How important is it to actually have "alone time?"

Hello, I'm approaching 2 years on HRT and being asexual, HRT has denounced my sex drive even less. I hardly ever masturbate since it just makes me uncomfortable, only ever having climaxes with my girlfriend.
I am however worried about prostate health. I read a lot that prostate health is linked to masturbating like twice a week or something and I'm way below par on that, and have been forcing myself to do so just for the sake of health.
My question is how important is it actually to masturbate as a trans girl?