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So I will like to give out very simple advice please keep holding your Bitcoin your investment is safer in Bitcoin and for great peace of mind always try to hold your Bitcoin as Bitcoin price is limitless am going to join the steel hands, Bitcoin holders, very soon.
One of the ways I save my Bitcoin is by buying during the deep never looking at it again for over some time. I have learned big from that small mistake of the past 2020-2021.
Do you consider this as a mistake? Do you really think that Bitcoin will reach $67,000 at that day you sold your Bitcoins?
You focused more on the profits that you can get on that day rather than holding it. I don't consider it as a mistake though since you got profits though it is lesser. What's wrong is either you bought Bitcoins at the peak and sold at the bottom or you never bought Bitcoins at all.
Even I have experienced that thing but I don't consider it as a mistake since I didn't got any loss for it. I got profit from it and I didn't regret even though I saw the coin going higher at the price I sold my holdings. There are many more who have experienced that too. Well, its good that you adjusted your strategy and will do dollar-cost averaging and will hold Bitcoin for a long time since that is what most of the Bitcoin holders are doing.
Still, I don't see this as a mistake or anything at all but a good thing at least since you got profits from your investment.