I will regret why I have not putted all my bank fiat,land a, Gold and extra money into Bitcoin.
You will always feel that regret at the end and you won't do that if you see bitcoin's price ranging from $10k-$30k. Because you won't feel that it's going to be up soon and the price will rise as much as it can until it finally reaches the most awaited price of $1M in the future. That's why as we're just discussing right now, you won't feel that there's a need for it to buy while it's cheaper than the price being tackled.
1 million is possible but Holding is so difficult. Market situation always differ. So no one can exactly know, what will happen tomorrow.
It's easy to hold but there would always be the temptation of selling whenever the prices goes on high.