Xenoblade Chronicles 2 Torna DLC Question

Hello I’m new to the series and with the Switch 2 upgrades releasing I decided to pickup all of the games including a physical copy of Xenoblade Chronicles 2 Torna! Unfortunately the code that came with it was already claimed so I’m a bit unsure on what to do. I know that Torna is the important dlc but how necessary are the other ones? Would it be worth buying the expansion pass despite already having Torna?