If there was a time machine, most people would want to go back to the cheapest price of Bitcoin and buy as much as possible to get rich. But time cannot be reversed. Now that you know the potential and value of Bitcoin, it's never too late to buy. Buy and hold for a long time, when BTC reaches a new ATH in the future, you can still make a profit.
I don't even need a time machine, because from now on we can see the future of bitcoin and as long as we invest now, we still have the potential to make big profits in the future. Bitcoin is still pretty cheap, and imagine if we buy bitcoin now and in 10 years bitcoin hits $1 million, we will also be rich without going back in time. Don't think about things that will never happen, live with reality and don't let it slip away again.