If you've been doing all the things described as being helpful and your child still is not progressing, then you will need the help of a mental health professional who has substantial training and experience evaluating and treating adopted and foster children with attachment difficulties. Many children will NOT respond only to parenting because the pervasive negative effects of trauma make it so that what you have to offer just doesn't sink in. Such children need Dyadic Developmental Psychotherapy in addition to attachment-facilitating parenting to heal. You should be able to find a therapist in your region at
Assoc for the Treatment and Training in the Attachment of Children
regards