It's sad but we really do have to let go and just pray and hope they find recovery on their own.
My son has been missing, lost in his addiction somewhere for 9 years now. He knows how to find us when he finds recovery. People ask why I don't search for him. My answer is that when I find him, then what? I did the search thing for years before all this. It never changed him and almost killed me.
Like you, I found my 12-step program, for me it was CoDA (Codependents Anonymous) and went for 10 years until we moved north. I occasionally attend Al-anon up here, but am grateful for the foundation of recovery working those 12 steps gave me.
You sound strong in your recovery too. That will see you through a lot of rough days.
Hugs