TX Dems problem is they do so poorly with anglos that it doesn't really matter if Latinos turnout at better rates. Must make inroads with white voters which no one down there has figured out how to do.
I think running a pro-gun candidate is a big start. a pro-gun Democrat should instantly do at least 5% better with whites in Texas than a Democrat who supports gun control openly.
Someone is clearly unfamiliar with how pro-gun the Texas Dems were, consistently, through the 1990s and 2000s when they were going extinct.
No one cares if you are pro-gun if your first vote in the House is to make Nancy Pelosi Speaker.
EDIT: My point is that individual candidate positions matter
much less than they used to.