step 1: label all nodes, already done they are v1, v2 or GND.
step 2: make an assumption about the direction of current flowing in each node, doesn't need to be correct, just consistent. (draw arrows on each path (not node) which way you guess the current is flowing)
step 3: express the current sources as complex numbers, i.e. encode the phase into the value
step 4: write 0 = the sum currents flowing in (+ve) and out (-ve) of nodes with respect to the voltage difference, impedance and current direction of each node (BE CONSISTENT).
i.e. current flowing from V1 to V2 would be (v1 - v2) / -5j
step 5: doing step 4 repeatedly should form X equations with X unknowns which can be solved simultaneously
ALWAYS BE CONSISTENT WITH CURRENT DIRECTION, SIGN (+ve or -ve) AND WHICH SIDE OF THE EXPRESSION YOU WRITE THE TERMS ON! SERIOUSLY YOU CAN NOT GET THIS QUESTION CORRECT IF YOU DON'T