Nope you really only need more attacks during boss,
you could just take Sentinel instead of PAM for roughly equal all day damage.
What's your best crit-fishing build?
Elven Accuracy only works with attacks that use DEX, INT, WIS, and CHA. Reckless Attack only works with attacks that use STR. And the whole build starts to fall apart without BOTH of those.
I say just go Half-Orc Fighter 4 or 5/ Barbarian 3 or 4/ then Fighter the rest of the way.
You could run a Half-elf Hexblade up to level 9, so you can cast Elemental weapon out of a level 5 spell slot for an extra 2d4 damage on all of your weapon attacks (+5 on average, doubled to +10 on crits) Darkness+Devil's Sight+Elven accuracy allows you to roll 3 d20s to hit, Hexblade's curse lets you crit on a 19. From there I'd probably MC Paladin for Divine Smite. You could also run a Tiefling, swap out Elven Accuracy for Flames of Phlegethos (use fire elemental weapon). Rerolling the first 1 on a d4 is +0.5 damage.