I kinda see what Tallulah is saying.
This is nothing concrete (which if you are an ISTJ you'll hate) but I get a similar vibe from all the bonafide ISTJs on the forum, and you match it. It's just a specific straight forward matter-of-fact way of posting.
I especially saw ISTJ in your Not Feeling Significant on This Forum thread. I also wouldn't get too caught up on Si/Ti loops or whatever when trying to find ur type, start at ur simple preferences. E/I, S/N, etc... then get into functions if you want, but I've seen function theory really mess up people's typing game.
And hey, if someone finds the traits of Ns admirable, but they might not necessarily have them, you can be pretty sure a good number will "test" N.
There is/was another ISTJ on this forum, Mathew Z or something, who kinda idealized INTPs I think, while overlooking ISTJ strengths, but I think in the end self-typed correctly, after claiming INTP for a while.