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If America is an option (you mention Austin), the non-coastal Western US could work.

A lot of those states get good water from the Sierra Nevada or the Rocky Mountains.

Those states have either no or low state income tax and largely leave residents alone. (For example, the difference between CA and NV during Covid was night and day.)

Southern NV gets a lot of sun throughout the year. NV has no state income tax.

I’ve heard good things about the area surrounding Las Vegas, though I haven’t been myself.

New Mexico could be good for high altitude (I think).