A therapist's job is not to hold you accountable. If someone else knowing and checking in with you about goals would help you follow through, a therapist might help. If you are really looking for someone to hold you accountable, though, I don't think a therapist will offer that. For example, when I think of being accountable to someone, that means that I would owe the person something and that they could enforce consequences on my life. No ethical therapist operates that way. On the other hand, telling my therapist I haven't been doing something I ought does tend to indirectly encourage me to follow through because I want to be able to tell my therapist I've done better if she asks about it later.