Short answer is: yes there are voters to sway. Less previous party voters and more non-voters. Texas is among the lowest in voter turnout: https://ballotpedia.org/Voter_turnout_in_Texas
From 2002 to 2024, the average voter turnout rate of eligible voters in Texas was 45.0%. The national average voter turnout rate of eligible voters for this same period was 52.4%.
Doing a good job governing and making people better off then campaigning on that success is legal.
Boring news cycles, but legal.