Immature rudimental biased Default Mode Network with internal configurations that are non-adaptive and biased in respect to occurring conditions   
Since the Default Mode Network develops over the time window from infancy to adulthood, lifelong collections of  Default Mode Network graphs should be collected to identify small-world network disturbances and biases. Experience - dependent plasticity interventions (psychotherapy-like) can be maturity inducing and network developing
Traditionally psychotherapy and symptomatic medications Serotonin Specific Reuptake Inhibitors (SSRI’s) and Anxiolytics are administrated. There is an important value for plasticity induction combination with psychotherapy (which is actually Experience-dependent-plasticity induction). Thus consider alternative (enhancing) neuronal-plasticity induction using cortical transcranial Magnetic Stimulation (TMS) transcranial Direct Current Stimulation tDCS, transcranial random Direct Current Stimulation trDCS. Additionally, consider personalized Virtual-Reality (VR) psychotherapy. Use any intervention that will enhance Small World Network maturation.