Mustrum_Ridcully
Legend
One thing to keep in mind is that a "simple caster" does not need to have the breadth of options a complex caster has. In fact, that would be counter-productive, the breadth is part of the complexity.
The goal is to have a way to play the narrative role of someone that uses magic for his purpose.
A complex Wizard might cast "Knock" to open a locked chest and the "Jump" spell (or the fly spell) to get around a chasm and Charm Person to get a guard to look the other way.
A "simple" Arcanaist might spend their mana token for "Arcana Aid" or spend a short rest to refocus his "Arcane Insights" and gets to use their Intelligence instead of Dexterity for a Dexterity (Thief's Tool Kit) check or Strength (Athletics) check or Charisma (Persuasion) (or gets proficiency, or gets advantage, or a combination of them).
The goal is to have a way to play the narrative role of someone that uses magic for his purpose.
A complex Wizard might cast "Knock" to open a locked chest and the "Jump" spell (or the fly spell) to get around a chasm and Charm Person to get a guard to look the other way.
A "simple" Arcanaist might spend their mana token for "Arcana Aid" or spend a short rest to refocus his "Arcane Insights" and gets to use their Intelligence instead of Dexterity for a Dexterity (Thief's Tool Kit) check or Strength (Athletics) check or Charisma (Persuasion) (or gets proficiency, or gets advantage, or a combination of them).

