You change their policy by giving them consistent and overwhelming victories.
Rewarding them with victories? They never have victories. They have had control of all 3 of presidency, House of Reps, and Senate for 4 of the last 24 years. Or 6 of the last 32 years. Or 6 of the last 44 fucking years. They need all 3 to do much of anything and they basically never have it. So they go to the center to find voters. So try something new and give them actual victories.
Every time any politician gets into office is a victory for them. That’s all they care about.