I believe the longer a person has been HODLing, and the lower his/her average purchasing price - he/she would have less probability to panic. That's perhaps because of simple human psychology and experience?
Think of person who bought his/her Bitcoins last cycle with an average purchasing price of $5,000 vs. a person who bought his/her Bitcoins this cycle with an average price of $50,000.
The solution for people who panic - Cold Storage in an offline computer. It will take a few extra steps to move your Bitcoin, making you not to move them at all.
Investing in the DCA method is the easiest method for all individuals, as one can invest in Bitcoins without any accumulated money. It's a simple solution if you notice, anyone should be successful in investing in bitcoins but the strategies must be known.
A person with no money can play either weekly or monthly, and one can invest with accumulated money because he will only buy dips and continue to buy bitcoins using the regular DCA method. If you invest in Bitcoin in this way, the average purchase price will definitely come down. And it's the most long-term of Bitcoin holdings.