I think there is no reason to wait more, it seems that bitcoin's price will not go to $4000-5000, as it is low and close to $6000 it is probably good time to buy bitcoin or undervalued altcoins.
When the price rises, it gives a positive signal to the whole ecosystem - obviously, when the courses fall, it does not bode well.
If the price grows too fast, if many run to this signal to quickly enrich themselves, then some may lose their money - after the peak the rate will drop dramatically. In itself, the rapid growth of Bitcoin is nothing wrong, but personally I prefer that it grows more slowly - as it becomes legal in a larger number of countries and it starts to be used more actively.