I know what Hillary should do. I'm going to tell you now.

1. First, there's no way she can compete with DJ Trump for news cycles. He's going to win them all. Nothing HRC can do about this, so don't even try.
2. If enough US voters don't figure out Trump, and don't get tired of him, then he might get elected President. But those are two big ifs. He might run out of slanderous things to say, and the press might get tired of running them. Or not. We don't know what'll happen.
3. The best approach imho is to do what all candidates must do. Tell a story about how great it'll be when you're President. Good story-telling gets people to feel like they're part of your team. It would be really something if that continued past the campaign, but for now that's extra credit. We have to prevent President Hitler from getting elected. 
4. Mohammed Ali used this strategy. He called it Rope-A-Dope. Here's an interview he did with Howard Cosell where he explains how it works. Hang out in the corner, against the ropes, put up your guard. Tease the opponent. Make him swing at air. Over and over. Round after round. Until you're pretty sure he's out of energy. Then push him over.
5. Don't try to be what you aren't. It won't work. Put yourself in situations that are comfortable. Let others fight with Trump. You tell us stories about what it'll be like when we have a real President taking care of things, vs a reality TV star with dreams of grandeur. 

And we have to hope it works. That's all we have. ;-)