The difficult part is here, in March 2020. Look what happened, Bitcoin broke down below on that trendline, it could happen again? We will not know.
But if we will use this basis, it is more positive to happen, only 2/3 happened since 2018, because last March 2020, it broke down, the other 2 bounced back. So, another good basis for buying this dip.
Funding rate supports to buy the dip too. See
some charts from Clemente.
Even if Bitcoin break down that is bad but if history repeats, it will recover and move up above the trend line later. Buying dip means taking a good opportunity with risk acceptance as well. If you accept risk in a dip, you can buy it. Especially, if you see risk is smaller than opportunity.