Time not included since bitcoin market is unpredictable, but your personal analysis and forecast is highly welcomed.
Is there any other strategies needed to accumulate bitcoin?
To me since we already have the DCA method which I think everyone is applying to accumulate bitcoin gradually there are no much other thing I know anyone can apply than that, except if we are talking about how much they should used to accumulate their bitcoin. Of course its always advisable to use a very little amount we don't budgets for something very important to invest in bitcoin and this, we can hold it for as long as we needs it without being so much in hurry to pull it out without letting our investment gets to the right time we have projected it.