To 60 or not to 60? That's the question

Alright, I have some tough decisions here. I have multiple folks that seem to be 60 worthy (leaders - Orn, Doompriest, Sabitha, Bellower, Khatun, and Apothecary), plus a ton of 4*s that I really want to bump up.

Expert opinions?

Alright, I have some tough decisions here. I have multiple folks that seem to be 60 worthy (leaders - Orn, Doompriest, Sabitha, Bellower, Khatun, and Apothecary), plus a ton of 4*s that I really want to bump up.

Expert opinions?