Not missing the turn

Hi Pat, I hope VIPs appreciate that the value of our membership is not only in making money when the market is good but in the great job you've done in helping us protect our capital during this brutal sell off.  However, I guess that's half the job done because we need to get back in at some point and not miss too much of the initial rise but accepting we are unlikely to catch the bottom.  In 2018 I did well getting out but couldn't bring myself to buy again late December, undoing a lot of the good work in missing the plunge.  So after all the rambling, here's the question - how do we know it's time to get back in the water and build a portfolio again?