You made your fair share of mistakes, however I think the main one is that since you had some experience in the forex market you traded the altcoin market in the same way and that is not correct, altcoins should be traded as a more risky version of penny stocks in which fraud is also widespread, this is why it is often recommended in the forum that newbies begin their journey by trading and investing only in bitcoin, and once they gain more experience they can try to trade altcoins if they want.