What are your key motivations?
Learn enough of the right things to orient myself in the world and derive a sense of continuity and meaning, apply what I learn in a way that helps other people orient themselves in the world and derive a sense of continuity and meaning. It's a simple answer but the question isn't very specific.
I would also like to know where your Ni is usually focused at and how does Te fits into being a 5w4. Also, if you think that finding your own truth is more important than finding universal truth and if so why.
Ni isn't always focused for me, exactly. It's often very dreamy and nebulous and strange... but when the stars align my Ni-brain suddenly gets high-def about the subject matter it's faced with, like I've just had my intellectual camera lens adjusted or something. The subject matter is usually determined by some combination of Te (formal data and organizational principles), Fi (what stirs me emotionally or ethically) and Se (informal data AKA my experiential perceptions).
Regarding how Te "fits in" to 5w4, well... like any other INTJ I take pleasure in devising my own organizational systems, but the systems of whatever sort I devise or prefer are often more iconoclastic than that of INTJs of other Enneastripes. I like working with hard data, but want to synthesize it in unique rather than completely conventional ways.
And I don't think that universal truth and personal truth are all that separable. There's the truth about the nature of the world (inasmuch as we have access to that), and there's the truth about the part of the world that
is us, and there's a practical truth to be found about our most effective or personally fulfilling potential role within the world. No facet is worth having strictly on its own... perfect anomie is more or less humanly intolerable with or without perfect knowledge (and as a 5w4 I expect I know a little something about feelings of anomie).
@Figure's outsider's perspective insights are well worth listening to. I especially agree that 5w4s
tend to be more Ni-heavy than 5w6s overall. Te is an objective function and 5w6 is the more objective of the two wings - 5w4s by virtue of the 4 influence are more idiosyncratic and surreal - Ni is subjective and abstract. Because 4 and 5 are both withdrawn types they're more prone to withdrawal (6s tend to be joiners in their own way, its title often has "loyal" in it for a reason) - Ni is an introverted function and when JCF-normative INTJs tuck into themselves Ni is where they're going to go.
I don't know if it's that 5w4s use Te less or less competently necessarily - I have a very Te-friendly job so it's easy for me to tap - as that having a 5w4's fixations is an invitation for dominant Ni to dive deep and grow such that it's very easy to get lost in. As a kind of world-building function it intersects neatly with the 5w4's tendency to have a somewhat uniquely weird and potentially even dark inner vista.
It is kind of amusing to hear of another INTJ 5w4 that also does
wild things like cry in public occasionally. I don't know if the fact that I have is un-Te though. I used to be very good at holding back tears so it isn't lack of control exactly, but I've learned to see them as a bodily function useful for stress relief and like any other bodily function, if I need to do it or would benefit from it, I do it. Maybe my benefiting from it as often as I do is related to some 4-ish internal melodrama, it would make sense, but either way: I don't
like doing it publicly but if it's the quickest way to get past something and I happen to be in public when I need to get past it, I'll let it happen without too much of a fight and without caring how it looks to the people around me (if they think I can't tear up and clean up at the same time I'll just show them different). In a sense my refusing to cry was much more emotionally driven than my crying ever has been.