I believe the term you're looking for is abrosexual, that's what it means for attractions to change (not saying genderfluid doesn't also apply here, I'm just giving the term that applies to sexuality).
I'm bi, and like pan people, a ton of us see a shift in attraction on a regular basis. Bi/pan/abro/poly can all apply to me, although I prefer bi because of colors ❤💜💙
I personally think they all fit under pisexual, the superior sexuality. It has no flag, just the symbol π
Genderfluid pisexuals are like the queer avatars, able to harness the entire LGBT acronym. Some speak of a legendary queer who can embody the entire LGBTQIA2S+ acronym, but they apparently hibernate for 200 years and won't wake up until 2086.
When I thought I was a boy, I got a taste of that gay male identity, so I have experienced the entire acronym. I'm just a woman now, so I'll have to settle for LBT, and str*ght 🤢