I stopped caring at all about Bitcoin exchange rate with fiat currencies for roughly 3 years now. It's a useless chart. It says nothing because Bitcoin is the unit all things are measured against not the other way round.
Sure, I get this mentality but can you share how you shifted your mindset in this way?
Overall, I think measuring Bitcoin adoption is complex. Definitely interest over time is a good metric but also merchant and consumer adoption is key. I think a good indicator of adoption is when you start to hear friends, family, neighbors, co-workers, etc. starting to talk about and use Bitcoin.