How to reply to "I hope you are well"? [closed]

This is very subjective to what message you want to send across.

In a formal setting, you could say "I am very well, thank you." If you'd like to inquire about the other person, you could follow that with "How are you?" or "I hope you are well too."

In an informal setting, you could simply say "I am." There is no rule to this. It completely depends on you.