I know how to say "How can I help?" but I want to get the level a little bit higher by saying "How can I be of any help?"
What's the best way of saying this in French?
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Comment puis-je vous être utile?
"Puis-je [vous] être d'un quelconque secours?"
It's the best fit for 'can I be of any help' and it's usually the most polite and correct way to say that In French.You'll find that expression often in books etc...
You can say « Puis-je vous aider de quelque manière que ce soit ? »