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That's where you nailed it, @OP. Investing in an altcoin can be quite simple, but knowing the token that's going to give you a huge profit is very difficult. As a fact, you can invest in so many altcoins and end up losing your money with almost all the tokens, unless you get lucky that one becomes profitable.
That's why it's advice for an investor to only put in the money they can afford to lose, so that if they don't profit from the investment, they will just accept their loss. In some cases, even if you take advice from an experienced investor, they cannot determine the particular coin that will be profitable to you. Also, if you do proper research on a coin, you might not be accurate all the time because there are some that look legit from the beginning, but at the end, they can just fail while your investment is still in the coin.