It depends on your preferences and what do you want to achieve from your investment. I personally have many investment strategy and the most profitable ones are the most risky ones. The more risk you are willing the take, the more profit or more loss you'll have. If you go for lesser risk, you may take a lot of time to get a small profit.
One of the less risky investment at the moment is on established crypto which are at their much lower price as compared to their all time high.