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Not to belittle, but at that time because of our lack of knowledge about bitcoin, many of us ignored it and back when bitcoin was not too valuable, only a few people thought that bitcoin could develop like this, and some were even willing to waste their bitcoins in vain.
We can't repeat all that again and the most important thing now is how we must consistently collect bitcoins every chance we get by doing DCA by taking advantage of price drops, maybe this way we can have the opportunity to get maximum profit if one day the price of bitcoin soars.
Regretting anything that happened before is useless and you are right that what needs to be done now is to buy and accumulate as much as we can. Bitcoin will continue to gain high interest as a long-term investment asset and its price always fluctuates all the time. There are times when we need to sell bitcoin and buy more at a low price, but if you want to accumulate without intending to sell, then that is also a good option.
Over time the price of bitcoin will go higher and so far we can really see the fact. Not many people were optimistic in 2013 that bitcoin would be worth $111k by 2025, but in reality bitcoin can hit that high. In the long term, bitcoin seems to continue to rise beyond what is currently thought.