How did you master The Art Of STFU?

I am tired of nagging and criticizing and sighing and having a bad attitude. My husband has had it. Something needs to change because my marriage is suffering.
Please give me all your advice on how you learned to stfu. I don’t just want to be good at it for one or two days. I want it to be a part of who I am, for the benefit of everyone in our family.
I’ve read The Surrendered Wife when we got married but it’s been almost 10 years now and I’ve still so much to work on and improve.

edit: I just got permanently banned from a motherhood subreddit for posting here.. what is wrong with reddit?