If he /she opted out, it is forbidden for you to recontact that person for this purpose. However, if the person who ceased working in SFI or renounced becoming active but he/she is still there in the team, you may try to discuss with the person. Try funny questions to see how he/she is doing, how life is treating him/her etc. Show them you are interested in their fate.
But I cannot assure this is a 100% sure solution, NOBODY can guarantee a solution to this. World is so complex...
