We might be in wave 4 of an impulse, playing out as a triangle, meaning we will have only one more push up to around 21 before selling hard.
This move to the upside is wave C of a zig zag wave (B) of an impulsive wave ((4)).
How to trade this ?
Wait for wave 5 to develop and terminate, then wait for a pullback in an impulsive manner for a lower degree wave 1 after which you can sell the pullback of that move, i.e wave 2 of that impulse lower.