That's it, while the major institutions can do whatever they can and are able to buy in bulk and thousands of bitcoin. We as simple investors can do little by buying through DCA. And if you're onto the point that you want to sell, the matter is on how you are satisfied for your time of selling. But as you can see, many from the forum don't want to sell as soon as possible and there are more prolonged plans that they'd sell at the right time with a better pricing and no one knows when that time is going to come. As soon as you're wanting to cash out and you're happy with the price and that's how you reward yourself then do it.
We cannot compare what large institutions do with the investments we make. However, in this case we can conclude that currently many large companies are buying bitcoin, so don't sell your BTC holdings to those who might have difficulty finding a cheaper price like the first purchase we made. The level of complacency is always there but for now we have to be against taking it because in the coming years bitcoin will be more expensive and that is because of the scarcity that is occurring.
You have brought up a very relevant part, many big institutions have already publicly announced to buy bitcoins and many institutions are buying secretly. If small bitcoin investors like us don't decide to sell at this time it's price will go more high. For now holding is going to be easy business for us. Big institutes can buy bitcoin to meet their needs but we shouldn't sell bitcoin there. So your bitcoin keep in holding status for now.