Well maybe Trump should develop an Oplan for how to force China to dump a useful tool nuclear armed ally and discuss it publicly on the campaign trail
Seriously
Once Trump starts getting intelligence briefings on what is going on in the world and why- he is going to be a very fast learner. He is a voracious reader and a very organized delegator and tasker of subordinates to research the details and tell him how to get things done
Maybe Trump should come back down to planet Earth and realize that there is no way China is going to remove Kim Jong-un just because President Trump tells them to.