Starting from zero, on purpose
My client did not have an existing newsletter, and their social media numbers were almost nothing. They had a YouTube channel, but it was not about the business. In one way, that is daunting. In another, it is a gift. There was nothing broken to fix, no bad habits to break. I could strategize and build everything from ground zero, the way it should be. And I like strategizing, so this was the fun part, not the scary part.
Diagnose first, then build; and treat zero as opportunity. Knowing the real situation aims your work. And a blank slate is a chance to build it right, not a reason to panic.