As per DCA principles, you must need to keep buying at dips with regular intervals as no one could determine the actual bottom. At the same time, for example, you today buy a dip and tomorrow another dip happens then you do not need to buy again. You may go for buying dips at regular interval it can be weekly or fortnightly or monthly or anything which lead you to buy multiple times in a year (just based on your available funds but plan up for more frequency rather than being all-at-once).
DCA does not mean you have to buy at dips. More accurately, it is your plan to load more Bitcoin for your portfolio daily, weekly, monthly or quarterly. It's good if you can buy dips but it is not mandatory to do so. DCA means you buy more Bitcoin and don't care much about your entry price.
DCA is for really long term investment. A very good example is MicroStrategy that bought Bitcoin at many dips but as personal investor, you can not do it too disciplined and professional like Micro Strategy. So DCA helps you to get rid of emotion, greed and fear. Long term, you have more Bitcoin and after a few years, you will see its value increases a lot.