If we talk about regrets in the past, we have thousands of regrets, not just bitcoin, but life is always moving forward, the past is the past we cannot change. What is more important is that we do not let the mistakes of the past repeat themselves. Everything is just starting, it is still very early to invest in bitcoin, and whether we really want to correct our mistakes or not is up to us to decide. Don't let us come back here 10 years later to regret it again, it would be a travesty for the world.
Many people also missed bitcoin in the last 10 years but they took the opportunity to fix things, I hope OP will do the same instead of whining and doing nothing.
Missing every opportunity we have will indeed make us regret it and it won't mean anything if we don't fix it because life will continue moving forward. Yes, you are right, don't let this happen again because it will be very painful if it happens a second time, but if we start now it will certainly be better because we already know the strategy that will be used to invest in Bitcoin.