Nothing will change until conservatives stop supporting liberals. Period.
The political establishment knows they have you in the bag to support what you say you hate. What possible motivation do they have to do anything different?
How is supporting the more conservative choice at each step supporting the more liberal person in that election? It logically can’t happen.
We can swing elections sometimes in big ways toward conservatives and other times it needs to be in smaller ways.
Since no election has perfect candidates, the best option is to support the more conservative practical choice every time.