If you want to speculate and make a profit soon, then sell; If, on the other hand, you do not need the money, you can wait and see it as a long-term investment and forget for a moment about its price.
You can be a short term trader if you want to sell right away after profit, but this ETH has a big community and solid supporters
and they continue to develop the coin, so as the number of investors are increasing, the potential of ETH to grow is big because it's next to bitcoin
so it's popularity alone would help.