Pick a dollar amount and (buy|sell) that amount of Bitcoin every week on the same day at same time.
By making a 'dumb' plan, you remove the enticement to try and time the market.
Perhaps even more than wall street markets, it's hard to day trade Bitcoin successfully: most of the advice you'll read is by people who are either lying, exaggerating or got lucky. The major issue is that there is a TON of non-public information that is much more relevant to price levels than publicly available information. Many smart players who are using 'insider info' will be able to eat your lunch.
I fully expect that someone has a very accurate model of the quantity of deposits at some exchanges via address linking, and is watching inflows and outflows carefully. I also expect employees of Bitcoin exchanges are passing data to trader friends. Knowing when a big chunk of Bitcoin is about to be tradable on an exchange is a great sell indicator, and USD a great buy indicator.
DCA means you invest the money as you get it. It doesn't mean you identify an existing lump sum and invest it slowly over time. Because you only DCA if you think it'll go up over time. Why would you DCA if you think it will go down over time?
So if you think it will go up over time, then if you have $x for it right now, put it all in. Don't DCA it because if you believe it will go up over time, then you're just missing out on the gains you believe will be there. If you're convincing yourself that it'll go down in the next 2 months before it goes up the 4 after that, you're just being too clever trying to predict the future.
DCA is just about what you do with additional money you get in the future, that you don't have yet. Like, if your DCA money is 0.5% of your yearly revenue, then after each paycheck, put that 0.5% of your paycheck into your investment. That's all it is. The idea is that it is to keep you from forgetting about the market and only investing when everyone's talking about it during the highs.
