In general markets conditions everything doesn't goes up it needs to go little down to find new support levels and there are some other fundamentals for price movements like newd positive or negative thats where markets reactions are happens and then prices move up and down. I think you need to learn more about it. Altcoins are very profitable, you just need to pick the right one. You have to buy it at the right time and sell it at the right time.
you are indeed correct selection altcoin is also one of the important contributions for one to benefit. need to learn a lot in composing any strategy, do not easily give up, and keep learning. hopefully, on the other occasions, you can get what you look forward to during this time.