I have been in a branding project with a client for about four months now. I struggle to even write that. I generated dozens of concepts, made tons of revisions, often with two weeks of silence in between, and have had enough. We're supposed to work on a business card project after we finalize the visual identity, but I cannot do it. I have reached my limit. How do I break up with a client? How do I say - thanks for the good times, but I've had enough?