I think this depends, because in fact I still get enough profit even though I trade in several altcoin, let's be honest because for bitcoin I don't have a very full mental to see the current conditions.
it is like you said that worrying about a crash will occur when buying at $ 40,000. although in fact the situation is not.

however this makes us a limitation that trading with caution is more than enough. yeah, I'm still grateful that even with altcoin there is still an income.