My smartest move up till now is avoid shillers.
They make decent accounts on social media and Telegram. Then they make calls so that people will follow and buy the coins they shill. Right after that they take profits and dump the coins hard. People who followed would just cry and blame themselves because they did not sell on the spike. I was one of those people getting dumped by shillers and lose a lot of money.
As for me, it's diversifying the altcoins. Although I personally think that at some point diversifying would limit your earning capqcity, it's still safest way. Spread your investments.