I'm INTP 5w4, do you know how much Enneagram and MBTI relate to each other? Since you're INFJ 5w4, how might we be different? (This might be worded weirdly but I hope you understand my point)
MBTI and Enneagram operate completely differently and tend to overlap in certain ways, but not always (i.e. INTPs are usually 5s but occasionally 9s, very rarely anything else, etc)
INTP 5w4s fit the idea of numbing emotion, not expressing yourself because you simply don’t know how (weak Fe), living in your head being very analytic and critical, not stepping away from inside your head/physically implementing things because of lack of Te or Se, being weird for the sake of being weird, doesn’t want to try new things because they didn’t work out before.
INFJ 5w4 is different. Not expressing feelings because Fe fails to explain the complexity of Ni concepts, not trying any further than theory because of weak Se (not being able to physically implement, safer in concept), more likely to just happen to be strange, analytic and critical but in very different ways (Ni with a little Ti rather than heavy Ti). Doesn’t want to try things because they have predicted that it will not work out. Emotional numbness only out of loop, not out of nature.
INTP 5w4s are much more classic than INFJs in everything with the exception of the fact that INFJs fit the idea of not wanting to try things past theory much more. The disintegration to 7, including physical stimulus and distraction, fits INFJ more, as well, as does the integration to 8 with Ti developing.