My two children have been adopted from kinship foster placement is there anyway that I can regain custody and my parental rights

If they have been legally adopted, its unlikely. You would have to show that your rights were violated in losing custody. You NEED to consult an attorney familiar with family law.

Am I able to regain rights?

Its really impossible for us to answer. We don't have the details about why you lost custody in the first place. If you have asked attorneys and they have advised negatively, I would listen. If you haven't consulted an attorney you ABSOLUTELY need to.