I am trying to find natural-sounding ways of saying things like: "Let me know if there is anything you need help with" or "Tell me if there's something I can help you with".
In my basic Spanish, I would probably just come up with something like "Dime si necesitas ayuda con algo" o "Dime si hay algo con que yo puedo ayudarte."
But I am wondering how native speakers might communicate this. What are common/idiomatic ways of expressing this? (particularly in Mexico or other Central American countries)