Harry, my only other suggestion is to seek peace with yourself that you can’t make them all change their way of thinking and that it isn’t your responsibility to somehow protect them all from themselves.
I’ve struggled with that myself with my daughter & her hubby who just can’t see what I see. They have taken some small steps at my urging but they are missing the big picture and I have had to accept that I can’t protect them from afar. It breaks my heart but they are going to do what they’re going to do. I know my son-in-law listens to what I have to say even if he doesn’t fully agree with me and so I planted more seeds for him to ponder this past week.