If you go through your entire inventory twice a year, you're already doing it. I have some equipment that hardly ever gets used, I just pick it up and cycle it a bunch of times every six months or so. Flashes get powered up for several hours every 2 or three months to keep the capacitors happy.
I store things in drawers, not cases or bags or wraps. No silica gel, silica gel is worthless unless you dry it out periodically.