Yup! This would be the right time to buy altcoin because mostly the prices are on sale and are on red flag. So if you have spare money there to invest on altcoins then now would be the right time.
This not the right time because there are some altcoin which got green candle, the right moment if the bitcoin gained the momentum to reach over $5000 as soon as possible and that means all of altcoin gain red.