What can I do if my sons father hasn’t done his visitations in six months he don’t call or text he’s supposed to pick him up every weekend?

Sadly, you can't force a parent to be responsible.  I would suggest that you contact him either via text or email and ask why he did not appear for his court-ordered visitation.  Each week, during his scheduled visitation, you should send him a reminder that this is his week and ask if he plans to exercise his visitation?  If he does not respond, after the visitation period is over, you should write a brief note asking happened, noting that the children were looking forward to seeing him.  If he does not respond to your inquiries, it doesn't matter because you are making a record.  If this continues for a period of time, you can return to court and ask the court to modify the order based upon changed circumstances.  The court needs to know that his failure to appear is harmful to the children's emotional state and having them look for him every week is too painful to continue.  Best of luck~