All successful people think long term. In fact, they do not cash out all their gains immediately after an investment and use the money to buy stuffs (expensive cloths, cars, etc) and later be broke-rather they think of good undervalued investments where they will make supernormal profits especially in the cypto space

That there is the secret of HODLing: patience. Patience and the stability to wait out declines.

You need belief, too. Why did Mike Hearn sell all his Bitcoin before its 2017 run? Because his frustration over the blocksize wars wore down his belief. He lost faith, so he couldn't stick with it.