After the A,B,C is complete an impulse move to the upside for wave 3 would make my previous triangle idea look unlikely to unfold. However further downside below the 0.618 fib level would support the idea.
Just below the break of the barrier triangle in wave 4 of 3 in C.
Just above the extreme of wave E in the barrier triangle in wave 4 of 3 in C.
The most common retracement for a wave 2 is the 0.618 fib level off the impulse. The idea of using this area as a rough target is supported by a drawn parallel from the start of wave A to the extreme of wave B of the , from the extreme of wave A. It is common for wave C to finish equal in length to wave A in a , this also supports the idea of C ending around this area.
Note: Just noticed some labeling of the internal structure of the impulse is wrong and I cant change it but the wave counts still convey the idea correctly.