We really never know when will altcoins dump, we should never blink an eye on the market of the assets we are holding for or you could use some algorithms like
Mudrex for you to make trading easier.
Actually, all trading is easy, it's just that the strategy and control are different,
because without good control everyone will also experience losses when doing any trading in crypto
You are right. controls when buying as well as controls when selling. sometimes some traders are fanatical with market trends. when the market moves in a pump then he will immediately panic to sell or even follow market trends by buying assets that are experiencing a pump. control in a trade does require more experience to master it.