Shoulda, Coulda, Woulda, Didnt

I am interested to know anyones things they wish they had done, and regret not doing because its just too late now.
My father passed away over 40 years ago. I never did sit him down and tell him with the greatest respect that I wasnt going to see or do things his way, no matter how much he refused to insist his was the only way to be right.
But I suppose having kids and grandkids who still love and care about me made my point..😷