namaskaram... you should have sold below 150. but we cannot change the past.
AVERAGING REQUIRES atleast TWICE YOUR INVESTMENT. IF YOU ARE OKAY WAIT TILL the stock reaches 120-130 and exit there.
i dont think it is going to touch 171 sooner.BECAUSE 150 is acting as strong RESISTANCE.
if you dont want to loose the trade you can average it to the current price(around 95) (that is huge in terms of averaging)
and put stop loss around 88.(90 level is a good support)