there is someone in Bitcointalk that I come across in which he still keeps His bitcoin and indeed that it made me feel stupid knowing that I have sold a dozen bitcoin in myt entire career here while He keeps His bitcoin on hold for that very long years.
It's just about a choice, whether you want to sell or not and based on whether you have a more important need and have to sell the Bitcoin you currently have.
I'm the same as you, selling bitcoin early, and even I sold Bitcoin for around $3k, and I don't feel sorry for not holding it.
From the sale, I learned that long-term investment is necessary.
Those who have been holding bitcoin for a long time, until now,
may have lost access to the wallet or they completely forgot to have BTC in their wallet.