ETH is the best altcoin, it is always recommended to buy and hold this coin as many as possible. But the price increase of ETH, mostly depends on the Bitcoin price trend. If you see it increased above $1,900 recently, it is because of the increase in Bitcoin price. After Bitcoin returned to $30k, ETH and other altcoins are following the increase, too. Now, I guess Bitcoin price will drop again below $30k, the uptrend is over. You must be aware that ETH price is following it, too. We can see the price of ETH is already below $1,900 again.
Not only ETH but almost every single cryptocurrency follow the movement of Bitcoin and move up and down based on that, it barely happens when an altcoin doesn't follow the price of Bitcoin and either grows or drops independently, otherwise, all of them move in the same direction. If we talk about ETH alone, it never moves independently, at least I've never seen it doing that so far.
Those who are investors of ETH should have bought when it was pretty low when Bitcoin was around $25k earlier, they could book profits now when the price of ETH went above $1,900 which isn't bad and one could easily get about 10% profit on their trades if they bought when Bitcoin was at $25k.