Even though there’s no Republican Party platform, Trump has revealed his plans in interviews.

Talking to the NYT on Wednesday:  
"But so I think, I think it would be, I think it would be very, very, I think we'd have a very, very solid, we would continue what we're doing, we'd solidify what we've done, and we have other things on our plate that we want to get done.”

And last month, in an interview with Sean Hannity, Trump offered this up when Hannity asked about four more years:
"One of the things that will be really great -- the word experience is still good, I always say talent is more important than experience, I've always said that -- but the word experience is a very important word, a very important meaning.
"I never did this before, never slept over in Washington. I was in Washington maybe 17 times and all of a sudden I'm the President of the United States, you know the story, riding down Pennsylvania Avenue with our first lady and I say this is great but I didn't know very many people in Washington, it wasn't my thing. I was from Manhattan, from New York, and now I know everybody. And I have great people in the administration. You make some mistakes, like an idiot like Bolton, you don't have to drop bombs on everybody."

So there you have it!  Glad the President cleared that up for us so beautifully, as only he can do.