That is why many people buy altcoins when they are first launched and make their profits and leave. Some altcoins are just like Ponzi Scheme, those who came and invest early make money or profit and those who came late would be the ones that face loses. So that one of the highest risky aspect of investing in altcoins. So if you want to make profit invest early and not procrastinating it. You can withdraw your capital and invest with the profit to see how the coin will go in the future.
I will also say invest according to trend because once tht trend stop the project might collapsed and as I said you can continue the investment either with the capital or the profit made from the investment. And all depends on the profit you made from it.
That's absolutely correct, most altcoins are just living shitcoins waiting for their market cap to increase before it's being activated as shitcoin. And that is why you need to be extremely careful before choosing any altcoin for investment. Those who came first will definitely receive their profit and sell at a higher price, but those who came late or was influence by trend will definitely suffer from the loss the coin will cause. If you must invest in short term project you need to be vigilant to know when to sell, but long term projects, you just need to have patience and let the coin grow.