Approximately 12 years ago I joined this forum and purchased what is now worth $1.8M BTC. If you don't believe me, that's fine, I don't care. I’m not providing my BTC address due to the recent Coinbase hack which would reveal my identity.
With respect to the current rate of Bitcoin been valued at $108,000 per BTC at the time of writing this post, then I'm pretty sure that the amount of Bitcoin whose current value gave you $1.8million must have over 16.66 BTC (i.e 1,800,000/108,000 = 16.66 BTC)[/b]. Which also implies you own a whooping 16 Bitcoins at the moment, which is actually crazy, judging by the fact that the amount you both it 12years ago wasn't even up to $50, and now 12yrs later, you are now a millionaire. Hence, in regards to if should you sell it or not, then to be frankly speaking, i will be wondering what you will be waiting for to not sell even if it's just 1.6 BTC while you keep holding the rest 5 BTC.