Very interesting analysis. Predicting a decline to .08 is too pessimistic in my view. While alts did take a huge beating in the past 18 months, I think people have more confidence in the "majors" like ETH, LTC, and XRP.
Late 2017, which is the time period you are looking at is just prior to the mania phase. I don't think we are in the same place, so I compare the current price action with Sept 2018. That would place us no more than a couple weeks away from a big spike in XRP price.
Whether we will see the surge depends on whether Bitcoin is going to range sideways for a couple weeks more before making another leg up. Alts like XRP tend to surge near the end of a Bitcoin correction period, where Bitcoin's volatility declines enough to make alts more attractive to buyers than Bitcoin.
Big question in my mind is, if XRP surges, what is a good sell range. Still puzzling over that one.