Most times as humans we feel more regret for the action we didn't take than the ones we took.
Yeah! I have one big regret when it comes to Bitcoin. I joined the bandwagon in 2012. During that time, even faucets used to give a good amounts of Satoshi for every action. Also signature campaigns used to pay huge amounts of Bitcoins as per today's value. So I was able to save up a decent amount.
But I had sold most of them in 2017 when I had purchased my first apartment to fulfill the co-pay requirement. As per today's value, it is more than my total mortgage.
I wish I could have kept my Bitcoins intact.