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I think introducing Charisma would be a good idea, although, in my opinion, Wisdom is sufficient to influence spells. I definitely support the suggestion to write about one's location!
I support the initiative with coins; it could even be implemented so that gold and silver are valued differently in different places (e.g., gold is cheaper for mages, as it is mined much more than silver, etc.). And it would also be good to create a kind of "price list" (in a separate post) so that it would be easier to navigate the local prices.
And it is definitely necessary to introduce restrictions on the strength of characters! Otherwise, you get some kind of 4th-level heroes where a hero-barbarian can take down dozens of enemies with a single shot... And I think such exagger