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.
We should all factor in two things here. The first one being that nothing is certain in a speculative market and that uncertainty provides us with two choices of either up or down, of either profit or loss, of either bear or bull. The second being that the chart OP presented was based on a lagging indicator on a weekly TF. It's possible for price to dip further and not reverse immediately once RSI touched bottom. We've seen that happen countless times but that doesn't mean it won't reverse. In trading, only the patient and disciplined succeed more. We've to be patient, going by that graph, to wait the weekly TF out (which could still be selling on the 4hrs & Daily TFs). Bitcoin dipped to $32,917 yesterday, although from what I'm looking at, there's a strong Support at $30,700. I can't say if it will get down there to garner strength for upward movement or not. If it does, that will look like the observation you made with the March 2020 date.