I lived in Denver briefly after many years in California and I loved it. There are many people there that are from California and also love it. If you can live without the ocean, then I’d recommend it.
I found people to be more friendly and active than in Californa. There’s a lot of youth and energy there. Depending on where in California you live and where in Denver you move to, you’ll find housing prices different. I found them much cheaper.

I moved to Denver 2 months ago and moved back to CA. For me I couldn’t adapt to the altitude. Some people adapt, I never did. Doctors wanted to put me on inhalers, etc, and I’m very healthy other than the altitute. Also, buy a humidifier if you move there as Denver is a very dry climate. If anyone has any lung problems, Denver is probably not a good place to live. Beautiful and clean city, but it snows alot, even through mid May. Not for me!