For peace of mind buy and hodl for a long term atleast for two bull circles you will be sure that whatever price will be then you will be in profit. DCA method is recommendable for income earners, buy with a percentage of your income and hold for the long term.
The market is not always going to be friendly. Every bitcoin investor should be aware of the volatile nature of bitcoin and so if you are investing, it should be on a long term base. We see how even up till now, some old bitcoin address are still untouched. Those fellows might have a much longer plan with their bitcoins. Sometimes we may conclude that the owners are long gone or wallet lost.
But with recent wake ups, I can say that the owners might have other goals in mind than selling off at mere profits. If you want to enjoy your bitcoin investments, keep accumulating and hodl..