Hi

I'm new to the crypto space. I'm looking at the ETH graph and I'm unsure if I should buy now. But its at an all time high, and I was taught to buy low sell high. I really don't want to be a sheep, but what if the price keeps going up? Should I just wait for it to go down and just buy the dip?
It may be too late to buy Ethereum at a low price, because the price keeps going up. It may be possible to buy at a price slightly lower than the daily price change. Eth is aiming for $5k, so how can we wait for ETH at $2k. Of course it takes a long time.