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How many Bitcoins are enough for a person is a subjective thing. For a person like me who hails from South Asia, 5 Bitcoins will be sufficient but a person living in USA or EU has different criteria of enough Bitcoin. But that's correct that once you are having enough Bitcoins then don't go for aggressive accumulation of Bitcoin because all of us are gathering Bitcoins to achieve a specific target and if you already have achieved that target then just relax. It might be a good point for you to start selling some portion of your Bitcoins to enjoy the result of their hard work .
For no coiners, the best strategy is to start investing from any point and once they start investing they can go aggressive on dips only when they figured out what actually a dip is.
Our different targets will determine how aggressive we choose to invest and once you have achieved your investment target I think you should consider securing some profit to help reduce the risk of exposure to market volatility as risk management is also an important part of investment and one of the qualities a good investor.
As for me I don't think investing and accumulation ends, even after achieving my investment goal and probably taken profit I will just have to rebalance my portfolio and set a new target probably higher than the previous one and accumulation continues.
At that point some would consider diversifying into other investments. Our goals are different.