Well almost every one of us here must have missed an opportunity which will surely made us regret, in my own case I had bitcoin which was up to a good amount, and as of that time bitcoin dropped to about 4000 dollars in either April or March 2020 I sold it at a very cheap rate because I never knew bitcoin would increase to the moon and also I needed some money, now this year bitcoin has rised to 35,000 Dollars , had it been I held my bitcoin till now I would have been swimming in profits .