Found out I'm an ENFJ

This sounds dramatic.

Times like these make me wish I were an ISTP or something.

I'm being honest here. Please think about this and how ridiculous it sounds. You're literally making comparisons in an MBTI-world rather than the real world. Stop.

Recently, things ended somewhat abruptly between us due to personal differences. We've made our peace since then, but reading other Reddit threads has helped me understand what went wrong.

What did you need Reddit for? Or MBTI? You answered your own question. There were personal differences. Outside of finances this is probably the #2 reason why people end a relationship.

made our peace

Clearly you haven't if you're on Reddit still looking for answers. You're not at peace with yourself and that's pretty undeniable at this point unless you're trolling.

But since you came for some kind of positive reassurance rather than advice (don't lie, it's easily detectable in your text) I will say this.

Don't worry about what went wrong. Relationships are not math equations. What went wrong in one relationship might go incredibly right in another. When a relationship goes south of course I introspect on what I did as a person, rather than what I did in the relationship. What were my personal shortcomings? What were things I could have done better? I think about that and I move forward.