It says Asei L’cha Rav – so get yourself a new Rav!
I once heard that when the Chofetz Chaim was niftar, R’ Elchonan zt”l went to R’ Baruch Ber zt”l and said his Rebbe was niftar, so he wanted R’ Baruch Ber to be his new Rebbe!
Find yourself a new Rebbe to guide you. Obviously you should feel the loss of your previous Rebbe, but you should not go on without one.