Photo by krakenimages via Unsplash  You’ve just brought a new client on board. Exciting milestone. But here’s the reality: the first few weeks of a client-agency relationship set the tone for everything that follows. And according to one study, 81% of agency leaders say strong client relationships are the number one factor in retaining accounts, ranking even higher than clear communication (67%) and campaign performance (49%). In other words, the relationship itself is the true…