ETH has shown over a long time that it is quite volatile, ETH can be invested for trading as well as for the long term because ETH can grow very much in a short time.
Shorter time isn't guaranteed that it would bring us a sustainable profit because bear market still influenced many traders, particular with the holders. Volatile market on cryptocurrency is a default behavior, and this present for so many years since the existence of bitcoin. In handling our asset, we must see to it that the rules of supply and demand will be followed.