Incorporeal enemies have double resistances against non-magical damage. Many other creatures also have resistances against some non-magical damage but incorporeal creatures are the biggest offenders.
Are alchemist's bombs considered magical? If not how can I make them count as magical other than with Celestial Strikes or Fiendish Strikes which are both very high level and would lock me into either Aasimar or Tiefling?
It feels like someone completely forgot about Alchemist with these resistances because unless I'm wrong all other classes deal magical damage because of spells or magical weapons.
EDIT: Another option I found is the Sprite ancestry which has Magical Strikes as a built-in ability.