Crypto is mostly unexpected and we don't know which token will give us high profit. sometimes we expect a big pump in the token and we believe that this project has a lot of potential but this token performance remains low throughout bull and bear season just like DOT and Cardano while some coins we often called them scam and spam pumped hard like ORDI, Pepe, Floki. It's all about trend when trend end then no one want to buy these coins.
What is your suggestions about profit from altcoins. Should we rely on only buying long term projects or we should invest according to trend despite of looking that trends coin will have no value in future?
All coin cannot give you profit and most of them are only profitable according to trend but after sometimes they become useless. The better way to earn money is that buy a coin according to trend and if it slightly pumps then sell your coin immediately because there is no guarantee that after year it will be same successful or will goes into dip.
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.