I didn't take any risk because I had no understanding about it, I never knew it is this valuable and sometimes I regret not taking the risk to invest.
The average new user has such an experience, but over time they will gain valuable insight into what they've been through, including the chance to buy lots of bitcoin at low price. But what's the use of regret?
For those who purchased at the early stage it was a privilege, not everyone had this privilege. One of the things that drew my attention from not buying Bitcoin was how people criticised so badly, it is glad I later had opportunity to buy bitcoin, their is no late time in buying Bitcoin and the benefits one can have in Bitcoin still remains.
Of course that's special, especially if they can afford to hold on to their bitcoin long term. Early investors have made big returns for the bitcoin they invested, even though it was deemed unfair which later became myth debunked by facts.
No one ever knows about the future, but it is still possible for bitcoin to make even greater history in its first 20 years. Imagine if in 2029 the price of bitcoin could reach $1 million, while many people missed today's opportunity to buy a lot, I think regret will surely be expressed once again.