When it comes to taking profits along the DCA line, one needs to apply a lot of constraints and shouldn't over sold at any point no matter what the price may be or the profits merging on the Bitcoin, since selling Bitcoin at every possible opportunity only lead to loss of your bitcoin holding, because bitcoin is more fun when it is held for the long term.
It looks like you are one of those people who are seriously considering continuing to hold Bitcoin in the long term because maybe you have put too much affection on Bitcoin so that you still want to hold it all the time without having to sell everything, even though you have seen real profits in front of your eyes. I'm quite motivated by what you're saying because it's really nice when we want to continue to hold Bitcoin for the long term and not oversell, especially when we don't have a sudden need to sell all the Bitcoin we already have.
There is risk associated with taking profits at every market advantage which is the possible inability to get those bitcoin back at the same value you first buy the bitcoin, and since bitcoin accumulation is a journey, one needs to apply the same time principle in both the buying and selling point without a rush in both.
The obvious risk here when all the Bitcoins we have is sold is not being able to get those Bitcoins back at the same price they were before. Yes, what you say is very correct because of the fact that the price of Bitcoin always tends to change at any time, although a lower price can still be expected when a big decline occurs. But it also doesn't happen all the time, so everyone needs to have time to be patient if they really want to buy it back at a cheaper price or at almost the same price as what they bought before.