The biggest and most common financial regrets people will have.
1. "I should have started investing and making financial plans, earlier."
2. "I wish I had taken more risks and tried more things, when I was younger."
I think regret will be experienced by all people even if it can be said to be successful in general. Suppose you ever heard this sentence from a rich guy, "I should've invested all my wealth in bitcoin 10yrs ago instead of just a few cents, maybe I'd be in the top 100 of the richest ppl in the world."
I believe that everyone has their own lifeline. To reduce the feeling of regret, "be grateful for yourself today".
I see that it's not a regret, but it's a picture of how greedy people are. You say here he is a rich man we can conclude that should be more than enough to make ends meet. But he still wants to be the richest man in the world. Yes, he said that because he saw the price of bitcoin which had continued to increase since its inception, but when the situation changed, none of those words would come out of his mouth.
I agree with what you said at the end, so we must be very good at being grateful for what we have achieved today.