Everyone has different ways to deal with it.
My father used to tell me that when you reach a creative block it is best to do something knowing that you’ll undo it later rather than to stagnate. I found that to be true back when we were building rock gardens … we’d add a plant or rock that did not really do what we wanted it to do, but soon afterward it would trigger a creative response that did work, so we’d pull them out and rearrange.
I find it works designing on screen as well. I will save my drawing, then save it with a new name so that I can always go back to the old one. Then I go on tangents, sometimes weird ones, that either develop into something good, or enable me to see yet a different path to follow. … and I don’t have to move rocks or plants to accomplish that!
I’m always saving drawings by adding a number onto the end of the cad file …. one job got to #42, but that was because the client was changing stuff constantly. Usually a residential job will be up to 5 or 6.