Well, seeing as a president can't really do much on their own, despite the fact that Americans seem to think the president is a king. The only thing I could do would be executive actions. So I would probably enforce some laws that are already on the books but aren't being enforced. Like not charging employers who hire illegal immigrants. Also, now that fast track authority has been granted for some trade deals, instead of pushing the TPP I would probably push to have NAFTA and other trade agreements removed.