Well, that's because Trump is still around - they're not going to pick an imitator over the original.
But once he's finally out of politics the GOP base will definitely be looking for a new cult leader to get behind. Sooner or later someone who's charismatic enough will come around, so we might as well expect it. The GOP isn't going back to Romney/McCain types any time soon.
Everyone who is currently around to run in the next 4 years for them are not anyone who is on Trumps level of charisma or persuasion
Cruz, Rubio, Vance, Hawley etc
Maybe someone will come up eventually but Trump is not easy to duplicate with how he connected to his base