Found this interesting piece that goes back into history and tries to identify why a rally will sustain or not -
Some valid points - some not so agreeable - essentially gist is that institutional investors/backing is driving the rally - so as long as there are new ones, ( like the recent BNY Mellon ) , the rally will continue
https://pythoslabs.medium.com/why-bitcoin-is-here-to-stay-b4e9a032a0f9?sk=a06522d2191a6a821b78971e427494d0