You can make money easyly in crypto just by doing long term trading, but you should understanding the trend of crypto market. If you predict the bearish trend ended and the trend will change to bullish, just buy good coin and hold it for afew month.
In as much as it looks easy to make money in crypto and No matter how good a trader may think he or she is or how easy it is to trade crypto currency, once still have to be very careful in trading in order to minimize risk when predicting and I dont think predicting by speculation is good for any trading but by indicators available to us through fundamental and technical analysis, and when you also talk about long term trading.
I think we can say that is the best way to invest for probably for retirement preparation for the best way to constantly make money is by day trading.