I'd hold.  Bitcoin doesn't represent a huge portion of my net worth (which isn't much anyway), so I'd prefer to have fun watching the market possibly go upward from $27k than to sell and be out of the game completely.

This prediction was made to keep Tom Lee's name in the news, and that's true for pretty much all of the big names that make these kinds of statements.  But in this case, he might be right.  July is obviously a couple of months after the halving, so it is quite possible for bitcoin to get up as high as $27k.  Don't know where that number came from, but who knows.  And as I've been saying, I'd be more than satisfied if bitcoin "only" went as high as $10k-15k.