Being a newbie, I really can't say whats going on but looking at the previous charts, this does look like a repetitive trend. If only our conventional share markets too followed such trends :D
Though this 30-40% drop is certainly a good time for those who missed the bus earlier when the crypto express was moving on at a supersonic speed.
Just for instance, XRP or Tron that was trading above $3 and 24 cents respectively barely a month ago (or maybe two) has now gone below $1.2 and 6 cents.
If this isn't perfect buying opportunity then I can't say what is :)