To the pro traders:
What do you do when the past two years of a WFA (10-15 year period) had an increasing loss (2017 = -4%, 2018 = -8%) while the other years were profitable?
Do you modify the strategy? Do you conclude that it's not profitable? Or do you ignore this because the average gain on 10-15 year period is positive?
What is your experience and what do you do typically do with a situation like this?