Boots are built on a last — a wooden form shaped like an average foot. Yours isn’t average, so where your foot and that form disagree, the leather presses. Same spot, every time.
Which means everything you’ve tried has been a way around that shape rather than a change to it. Thicker socks got you out the door, but the boots are still tight and now your feet are hot too. Conditioning spray softens the surface and leaves the shape alone.
Breaking them in works eventually, if you’re willing to spend two weeks walking it off. And the cobbler works — $50 to $65, and two weeks without your boots.
Four fixes, and the leather is still the exact shape it was on the shelf. That shape is what’s pressing on your foot, and it’s the one thing none of them touched.