Nobody can tell you exactly when to buy. In comparison to the last few months the price is relatively low , you can buy some now and just keep adding to that stack every month. This way you can average the price you bought for.
Nobody will apparently, because no one absolutely understands or know what can happen next. However, if he keeps up with that mindset, he may never even get the chance to buy at this value ever again if he is busy waiting for a dip. This is market and no one knows the future and if he understands and believe in what he is holding, I see no reason why he should be waiting when the market is low already.