Shit coins will always be shitcoins either you buy low or you buy high, the most important investment advice is to buy good altcoins, those who invest in altcoins when they are high still makes lots of money out of them, years ago the ATH of BTC was 19k and this year BTC did 47k, strong coins will always bring profits
Well, if cryptocurrencies were a deliberately losing business, people would not have promoted it for so many years. Yes, many lose money due to inexperience or ignorance. 99% want everything at once, but this does not happen. You need to learn everything, even make money. If there is no understanding of the rules of the market or exchange, then there will be no profit.