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.