What I would really like to see in this game for warriors, guardians and possibly rangers, is the introduction of spears and/or polearms (or two-handed axes).
A spear could work as a high damage single target weapon that inflicts weakness or bleeds and has a bigger melee range compared to current one-handed weapons.
A polearm could work as a huge AoE powerhouse with high damage, but low mobility and average support (a middle ground between the greatsword and hammer).
The lefthanded weapon and righthanded shield could be done with an option to make your character right or left handed. The abilities themselves wouldn’t change, only the character would now hold the weapons according to his main hand.