Best term for this by OP is, "Buy and forget"
By doing this, we are prone not to sell our holdings even when the price of Bitcoin goes down a roller coaster. And in this way also we are busy with other things so we can forget to check every time the market or the price of Bitcoin which will help us not to worry or panic just incase the price of Bitcoin dumps.
This is exactly what I think every investor of Bitcoin should do but it has been very difficult for me since I don't always forget what I have no matter how I have tried, the price of Bitcoin doesn't affect me no matter how many times I check but I think any one who is a good investor should not think of checking the current price of Bitcoin before they invest because there's no time that is early or late. A good investor will have it in mind that the price of Bitcoin may dump today and go up tomorrow so at every given time investors should keep acquiring Bitcoin.