History will not repeat again and again, If it was bitcoin would be at $15k right now. But bitcoin keeps pumping to over 19k proved that bulls are in control. So you never know, it might pump to 25k or even 30k. But now time will say what will happen to bitcoin, but it's true and very risky to buy bitcoin now, as it is too expensive at this moment.
Maybe expensive in the sense that if you are basing from its previous ATH, but if btc will go to 25k or even beyond that, the price today is not expensive. Depends on where you are comparing it to. From the time the OP posted this thread, the btc was in the 10k level, so only few months and the money if someone invested at that time almost already doubled its capital. That's actually a very good profit out there.