Just happened to me! Take a year to get your bearings, gain more research/applied experience and sharpen (or expand) your goals.
For me the biggest issue was that I tried to tailor one of my ideas to the program/POI, rather than opening myself and framing myself as a valuable contributor to their team. For me this meant throwing my statement of intent out the window and starting again from scratch.
Also if you have any external funding applications, it may be advantageous to write a proposal specifically off their research, so they can see that you're serious about their work and be