I'm not being critical of Perotista, mind you, but of the argument that the Republican party has made any real policy proposals in the last... oh, let's say, 10 years. The idea that there is a policy-based parity between the parties is a myth and it distracts us from the real issues. Focusing on the thread title, Which policies have conservatives advanced? I'll offer a list of topics:

Environment
Immigration
Economic stability
Budget/taxes
National defense
Homeland security
Criminal justice
Foreign affairs
Education

I'll also offer an opinion: true conservatives care about all of these issues, but the current "conservative leadership" doesn't. There have been a few successes - The First Step Act comes to mind - but then we get this: Senate Republicans reject effort to condemn Trump's Syria withdrawal.