That is the normal problem of new projects that are listed on the market. If you are a long crypto investor you should know that after the listing it will be a dumping situation and that is the time when you invest. You should hold it for the long term for a better profit. Dumping after the listing is unavoidable.
You are right, dumping is just like a norm now and developers should already be getting used to this, so what their strength should be channeled to now is how to build their product to a standard that will make it continue to have market value and stabilize the value of the coin.
Even if a project coin value is not that high, there must always be at list little increase to show its development, the more their product brings users to buy their coin, the more there will be an increase on the value of their coin, so I still believe that it is developers that has the majority of work to do to make the coin continue to have value after the initial dumping.