I just tried day trading in eth and the price fluctuations which happens continuously is something where we can make profit in daily basis, guys from today morning to evening I could have earned nearly 15 to 20$. Buying low and selling in a reasonable profit, again when it comes to my price I use to buy and sell for a reasonable margin this will work only if there's continuously fluctuation, just have a try and make daily profit.
For me, holding ETH long term has been more profitable, and also longing or shorting via futures trading too. However, the latter is risky comparatively. I don't think day trading ETH is best decision for me, but good luck if it works for you.