In this episode of AFA, I go over how I am able to read through large chunks of the Greek New Testament with no helps, and it is something that you can do as well, but it takes work! But this is based on that many ways of teaching NT Greek focus too much on memorizing grammar, vocab and syntax BEFORE you even start to read the New Testament in Greek, whereas this method has you start reading the New Testament in Greek on day one! Check it out.
Also check out J.D. Martin's video on the same topic which is helpful:
https://www.youtube.com/watch?v=EDNLNSSAPWc