Regarding Crypto

So like, alot of us may have heard of that fellow who predicted around a decade ago that bitcoin will explode, he made another prediciton at the beginning or mid 2023 that crypto would rise again and even if we doubt his words we should atleast put 5% of our income or something like that, now looking at the charts from the past 2+ months and bitcoin has spiked over 150% which is insane, do you predict it will plummet or go up again? And how do people like himself even know?