I want to have the goal "be more accepting of things I can't change", but I'm not sure how to make it actionable or measurable. How will I know if I'm achieving

I want to have the goal "be more accepting of things I can't change", but I'm not sure how to make it actionable or measurable. How will I know if I'm achieving it? In past years I've had very measurable goals and have generally achieved them; things like "have a conversation in japanese with someone in japan" or "get a new job".