Left Stick: Movement
Right Stick: Aim direction
A/X (Bottom): Basic Ability/Primary Attack
B/Circle (Right): Secondary Ability
X/Square (Left): Third Ability
Y/Triangle (Top): Fourth Ability
Left Bumper (L1): Potion (as you already have)
Right Bumper (R1): Interaction/Pickup
Left Trigger (L2): Show radial menu (inventory, character, etc)
Right Trigger (R2): Hold to show nearby interactables
D-Pad Up: Toggle Character Panel
D-Pad Down: Toggle Inventory
D-Pad Left: Previous Target
D-Pad Right: Next Target
Start/Options: Game Menu
Select/Back: World Map/Quest Log