It's funny how value is so subjective. Back then, $25, or $50 for 10k bitcoin seemed like a gamble but now it's a steal. Makes you wonder what else today we might be undervaluing in the same way.
Better not to think about it and just invest in what is already proven with time.
You know, that logic applies for many out there, and alts can be seen that way too - some of them are undervalued because of X. And you need to dig for said X to be sure that the project is really going after that X, not the funds to rug.
But Bitcoin is undervalued for the reasons we know, and it upholds its values to this day. So there is no need to do that.