Replace Obamacare with a rational healthcare system that allows choice for consumers and allows market forces to operate as much as possible in order to reduce costs. Providing for pre-existing conditions has be a part of it.
Appoint a conservative(or better yet a libertarian) to the vacant supreme court seat.
Seal the border and address the immigration situation. Work with Mexico. Legal immigration is beneficial. It must be a consistent and fair system that protects national security.
Lower Taxes.
Undue executive orders.
Deregulate as much as possible.
Rebuild the military but end continuous wars.
End the role of the federal government in education.
Term limits and a five year ban on becoming a lobbyist.
Adopt an updated version of "Glass-Steagall".
We will have to endure monetary expansion a while longer.
Eventually a balanced budget amendment.
Social Security and Medicare financial situation has to be resolved at some point. Both are bankrupt. The burden imposed on younger and future generations is intolerable and unethical.
Replace the tax code entirely.
Lots to do.