Congrats, you're doing really good stuff, a good start into biohacking.
I've been doing this for years, I now do 90C sauna and followed by proper cold show outside in the garden, using the garden hose My neighbours must be thinking either we're poor and can't afford a shower cabin / gas bill for hot water or we're in a sect or something, the whole family does it most of times
Look seriously into biohacking, some names for you here, there's more than just cold / ice showers:
David Sinclair
Rhonda Patrick
Valter Longo
Dave Asprey
Aubrey de Grey
Tim Ferris
Paul Stamets