I'm not sure Texas is as Republican as it appears, though it did go for Trump, it's heavily gerrymandered. It's not the most blue state out there either, but it's engineered to be redder than it is.
https://www.theguardian.com/us-news/...rd-right-texas"As Republicans push extreme bills in the legislature, they’re also bolstered by an extremely powerful political advantage. A decade ago, Republicans had complete control over the process of drawing the boundaries for state legislative and congressional districts. It allowed them to distort the lines to help Republicans win elections and guarantee their election in the state legislature over the past 10 years. This year the lines will be redrawn again and Republicans once again will have complete control of the process.
Texas may have the worst gerrymander in the country:
https://fivethirtyeight.com/videos/t...n-the-country/
So people moving there isn't easily going to change things (even all the liberals in California ha - but why would they want to? Might be okay for retirement but for young people or to raise kids? yikes) because there are a lot of gerrymandering backstops to prevent majority representation via voting.