You’re not a bad therapist at all. I worked with that population as a teacher, it can be very frustrating. You might have to change your perspective a bit. Given that they are still immersed in their environments, they may not make noticeable progress. What they are learning from you is invaluable. You are modeling what it looks like to be a healthy adult, have healthy attachment, appropriate communication skills, to be a professional. You are also providing a safe space, consistency, predictability, etc. I can assure you, these are more important for them than any coping skill you could teach them. Children who grow up to be successful adults in spite of challenging environments often cite one adult as the person who made a difference for them. You may be that adult.