If we want to buy Ethereum we have to look at the price chart first, when the price goes down then that is the right time to buy it. However, when the price goes up, of course don't and we wait for the price to go down first, unless we want to trade in the long term, of course that's not a problem. But actually we can also choose other alternative coins if we want to invest if the price of Ethereum is high, such as BNB, Solana or we can even buy BTC.