Dissolution of Marriage

[No children/ No support/ No Property] I have not seen or heard from this man in 27 years and have no idea where he is. I started the diligent search. I found his two most recent addresses and sent out two letters letting him know I want a divorce. One of the letters were returned as undeliverable. I still haven't gotten the second letter back and he still has not contacted me. I live in Wesley Chapel, FL [Pasco County] and his last known address was in Freeport, FL [Walton County] It didn't take long for me to figure out its way to hard for me to do this by myself; I need help!