Dollar-cost-averaging is not a strategy* in my opinion, but an artifact of how many people invest in retirement accounts, for example. They put in a set amount every period, and that helps balance out the fluctuations in value. If the market goes down, you invest in lower periods and benefit when it comes back up. Yes, the investments you made when the market goes up have a loss, but the gains average out the losses. If the market goes up over time, the good periods outweigh the bad and you make a profit overall.
What you're wanting to do is time the market. You want to buy low and sell high. Which is admirable, but it is not a feature of DCA.
If what you're investing in moves up consistently, then you'd have been better off investing it all at the beginning. If it goes down, then DCA will reduce your loss by buying more in the down times. If it is stagnant, then DCA does nothing on average.
If you want to DCA bitcoin, just invest a set amount of bitcoin every month (or whatever period you want) and see what happens. Nothing is guaranteed.
at the end of the day I want to make a profit for sure and not lose money
Not possible with bitcoin. There's no way to know what bitcoin will do in the future to guarantee a profit. If you buy and it goes down - do you buy more? What if it never recovers? The only reason you'd buy an investment is if you think it will go up in value. If you think that, why not just buy as much as you can now? Why buy some and wait for it to go down to buy more?
*To be fair, it can be a strategy for reducing risk, but not a strategy to maximize return.