The past few times I took the Meyer's Briggs test, I seemed to always be an ISTP.
But I tested it again today, and it scored me as an ISTJ.
https://www.16personalities.com/istj-personality
I think in my case, IST is an consistent assessment. I think I fluctuate some between P and J....because both P and J are both consistent, with how I process life, all around.