I would suggest that the "if" is simply a turn of a phrase, I likely would not attach too much meaning to it.

The "trying" might give me more pause however.

I think one of the most powerful tools a therapist has in their arsenal is the ability to instill hope. There has to be hope that things can get better.

This ability trumps all others I think.

IF you leave this therapist's sessions, on some consistent basis, feeling hopeless, then it may be time to move on.