Funny enough, seeing all types of different suggestions under the sun here in the sibling posts; it's also unsurprising, since I myself can't tell where the gap is between what the Pi offers vs. what you're hoping for, as that would have been the first thing I suggested.

In addition to all the other suggestions, you might look at PINE64's offerings. Maybe one of their tablets, their PinePhone, or one of their SBCs or SOCs.