I don't think McConnell needs to worry about Trump support, he's his own travesty. To that end I went to
https://amymcgrath.com/ and donated to her campaign.
Turtle's approval in KY is like 30% so I wouldn't consider that an unassailable position to be in from a primary perspective. Also, Trump is largely doing what he wants so he'd never rock the boat. Dude said he'd accuse Obama of trying to tilt the 2016 election if he exposed the ongoing Russian interference. He's more comfortable than most with the deal the party has made.
I think KY is a way outside chance pickup for the Dems. AZ, CO, and ME are the best bets with TX, GA, NC, IA in the next tier and a few flyers like KS where Kobach may be the GOP candidate. I'm mostly donating to that mid tier and will start in on the state house races later which are extremely important with redistricting coming up.