in essence we take good projects and decide for the long term. same as etherum or bitcoin, both are big coins and had reached the peak price before falling again, but we are still confident in their long-term project.
That's what you need to do before you invest, you must gain confidence on the coins you are buying because you are planning to hold it for long term. Long term holding is not good for a shitcoins so try to look for a most promising new project that you believe can make money for you. The future is can't be sure, but always make sure that your money is on the good coins.