The idea of constantly buying ETH even in the face of a clash is to be able to collect as much as you can until the time comes. If you know a project will rise eventually, investing in it even the challenging times is not a problem. As you already know it can go lower but eventually it will rise and shine. For ETH I can easily state that it will rise after the merge, serenity, and other updates to come.

A friendly suggestion: Always conduct a detailed search for a project before investing in it. You can find out many things.