I would not recommend you to follow any youtuber and i am 100% sure they will never tell you when to exit the markets. The reason is that people want to hear good news and these youtubers will make content with positive intent and they always keep the bitcoin and the altcoins market bullish.

I used to follow a few crypto channels and they keep the hopium alive even in bear markets and saying that bitcoin will reach highs very soon when it took 2 years to make another all time high. These YouTubers make content that will attract the viewers and viewers mostly want to see the positivity in the markets.