I sold my bitcoin in 2021 when it was at all time high and i am buying it when it is falling down. Not just i am buying due to falling. I am buying this time because i have faith in bitcoin , it will surely increase in future.
As long as you sell it in a very profitable situation, it's okay and buy it back when it drops, and the current decline is a good choice to buy because the bitcoin price drop is already more than 50% of its high price. And hold it for the long term, or you can do DCA considering the current bitcoin price is only moving slightly up and down which I think DCA is the right choice.
I personally only sell part of the profits when the bitcoin price reaches its ATH, and just want to enjoy the profits I get to buy something that I think costs a lot of money. And when the price of bitcoin goes down again I buy again like now which I think is the right choice to make a purchase and I do DCA, bitcoin is a future that I think will be much better and profitable, so I must still have bitcoin even though I make a sale and only sell part of the profit even then if really need it but I still cover it when the price drops again and it's even more profitable.