What I should do is what I should do in English.

Example:

You are a clever old man. Tell me what to do. ?

You are a wise elder: tell me what to do.

"Tell me what to do!" She begged him.

She begged him, "Please tell me what to do!"

So, what should I do?

So, what should I do?

What would I do without him?

What would I do without him?

What would I do? Who should I go to? Mom is still not at home. ?

What should I do? Who can I ask for help? Mom hasn't come back yet.