Its always a right time to buy if your going to invest into altcoin but before doing so and many have said this before research and spread your capital, bitcoin is going crazy but altcoin is still putting its shoes if by chance BTC ever reach 30K we might see some altcoin movement since the price is becoming expensive other investors with low capital will look for another way to earn from bull run.
Your are right sir i don't know the btc price high then altcoin goes to down and if btc price down then also altcoin price down but i agree with you sir that is the time to buy some best altcoin for further profit