tl;dr For a buy and hold strategy for any kind of crypto I suggest to allocate a budget for every month and every week to buy for the same amount. At any time in history, humans seem to over or underestimate the value of pretty much everything - that’s why there is so much volatility in the markets (stocks, crypto and other ressources). If we look a litte bit deeper its not so much that we get it right and wrong at the same time, it’s rather that the same resource has a different value to different people at the same time.