Buying in this zone is like thinking 4 years ahead when the bull-market has come and gone, and we're stuck wondering whether we've bottomed. Wouldn't it be nice to be in the green even if you did not sell the top? Well the solution is simple, because when our bull run starts, these current BTC Prices will be out of reach. We want to get in now, but hope still to see new lows. So check out the chart which explains how much time you have, in case you want to dollar cost average a set amount during this time period.
Also notice the Stoch RSI on Monthly generally stays on the overbought and sold zones, and the switch is rather quick. You definitely want to be HODLing with your private keys before that happens, so take into account finishing your buys AT LEAST a few months prior to The Halving.