if in my opinion the most profitable one is holding it right now, because the price of coins is still very difficult to develop, but if in the long run, the price of coins is very easy to develop and to get big profits is also easy
We can do both day trading and holding but now it is really advisable to keep holding a good coin like ethereum, bitcoin and neo this 3 coin is the best coin to hold ast this moment and for me day trading will be great to do if we are good in trading.