I don't have all the answers. But I am a millennial, and I can tell you how we think. My girlfriend and I are the only scuba divers we know that are our age.... And we live in San Diego!!! So that's ABSOLUTELY a market I would try to expand into.
That was eye-opening. I remember walking into at least 3 surf shops in San Diego only to discover the owners no longer surf, but go snowboarding instead. I joke that my girlfriend and I must have been born in the wrong bodies because she is from Los Angeles and is a figure skating coach who skis while I'm from the Pocono Mountains and I'm a scuba instructor who surfs. Maybe scuba has entirely lost its cool factor and is now officially the new geriatric shuffleboard?
"Yeah. We dive sometimes, but only to make our grandparents happy. They enjoy crosswords, knitting, and scuba diving."