When you have the intention to do DCA for years, any price must be bought according to your plan with the DCA method of 1 week - 2 weeks or 1 month at any price to buy.
Of course DCA strategy is mostly for long time holding so I see no reason why price movement or volatility should be considered while using the DCA, it is well known that DCA method is for slowly accumulation either daily, weekly or monthly and also the possibility of the price to remain the same as the first buying point is not guaranteed so if we should consider the price before accumulating it may seriously affect the strategy, so irrespective of the price of Bitcoin DCA strategy can never be affected because DCA goal is not for short time holding but for long time holding.