That person doesn't not understand cryptocurrency market and don't follow that person to invest in cryptocurrency. The best time to invest in altcoins on bitcoin is the Bear market. When the price is in the dip. But in the dip and hodle to the next All Time High. Once you know that the price is down then it is foe you to look for money and buy. Or you use DCA method to acquire every week or month. Don't follow unprofessional cryptocurrency market experts because they would misdirect you for you to either missed out or you don't have money the they asked you to buy.