That's why we should not plan for a single entry point. We could use any popular method to determine the entry points mostly at the dip of every cycle. And it surely was a better time to enter when the price was around 20K.
For current scenario, the price is trying to stick above 30K but as there are no sudden momentum, And I have a feeling it would eventually come down at least around 28K before trying to make a new peak. It would still be a better idea to keep on buying smaller amounts as even though the price decreases, you don't need to invest much to average your cost but if the price keep on increasing, it would be risky to buy at higher price.