Lots of previous comments here that I agree with overall. Not sure what you mean by “trust is gone” esp. when you plan to upgrade to another iphone by the same company… to reiterate a few points made by others, an “honest answer” includes:
—absolutely a non-mini (and a non-12-mini) iPhone will have way better battery life than what you’re dealing with currently
—it heavily depends on your usage, re: how well a 13 non-mini would serve you
—you could get a phone of any type, year, size and have its battery hold capacity for years vs. some that deteriorate much sooner (1.5 - 2 years is my average personally before it’s noticeably degraded)
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—waiting a 2 months might be doable if you need or want the latest or just to see what is released, but personally at 84% on a 12 mini I would update that immediately to either a 13 mini, or a 14 or 15 regular. Life is too short to deal with such a notoriously bad-battery model so many years after it was released.
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Finally, my own personal experience that is likely not shared by many, since 99% of people today walk around with ginormous phones sticking out from their pockets:
—if you’re at all like me you will not be able to deal with the larger phones due to how they are too big for pockets. I tried a 14 regular for a couple weeks, the larger battery and screen were great but the size was just not enjoyable for me, so I replaced it w/ a 13 mini. I will let go of this phone and my resistance to larger ones when I must (say in a couple years if there is no SE 4 or future minis) but for now I’ll keep this one as long as possible.
Good luck in your decisions, I suspect that whenever you replace it, with whatever you choose, you’ll be relieved and wish you did it a bit sooner.