Maybe this opportunity will come back if the coin price dumps again at a high level. But if this really happened would anyone still dare to hold their coins? Certainly not. Many people will complain if this condition occurs. Even if the price of ETH drops, the price will not be below 1k.
Now the decline and increase in prices always occurs only for a while without running for a long time in the market and the only ones that survive this pump and dump condition are coins that already have strong fundamentals.
Examples such as ETH and a very common thing to happen when a decline occurs is to sell existing coins before they all drop to their lowest point before buying back at a certain time.