You prepare for a beer market when purchasing and not when he beat market starts. When buying Bitcoin I use only spare money and plan how long to hold for, or at best and estimate of the time range before I get my desired profit. This means I'm not moved by the volatility in the market cause I'm not in any need of the money invested.
Evaluate dollar-cost: before buying Bitcoin during a bear run consider dollar rate.
Dollar Cost Averaging does not consider dollar rate. It's just a frequent and regular purchase of Bitcoin or any asset.