1.How did I lose my bitcoin?
I learned about the ETHBull and ETHBear Token which is the 3x leverage token of the FTX exchange. The price of ether was then below $ 100
At that time the price of ETHBear was $ 30 when I invested.Then the price of the Ethereum was around $ 120. At the same time, I panic and I made all my investments on ETHBear in the face of huge profit.
2.Big mistake of my life

this investment was done at the behest of a youtuber which proved to be a big mistake in my life.Now I have thought that do not invest at the behest of others.
When I lost my entire BTC, I felt very bad, please do not do it.
Thanks for all
Too bad you learnt your lesson in the hard way, sorry about that mate, I think there's a lesson to be learnt from your experience, and that is "not everything a YouTuber says you should accept or agree to", most times try making your own research before buying or investing in any coin, because most times those youtubers are been paid to create those videos, just to make other people believe the coin/token has potentials when it doesn't.