It seems more likely that bitcoin is on a logarithmic regression curve, like so:

The chart has been updated recently by Marc De Mesel
Below is the link to his YT video.
I refer to this chart and believe would could see more than 75% undervaluation
https://www.youtube.com/watch?v=k9JsmelO12sHe's counting 2015 as the beginning of the bull market, but it was range bound ($200-$300) the first 10/11 months.