There are some other American cities with "good enough" climates and tech hubs if you're not looking to be in the Valley specifically. Austin and Atlanta are two that would be southern enough that it probably meet the rest of your criteria. It may not be as nice as the Valley per se, but still perhaps nicer than what you're used to. If you're not particularly worried about being in a tech hub because you work remotely and intend to continue to do so, a whole lot of other areas of interest open up too, both in and out of the US.