Great question. I actually wrote an article about 33 New Ways to Measure Success. Here's some of my ideas:

• How much you laugh every day
• Free time
• Location independence
• Earning a living through helping people
• Enjoying the little things in life
• Making someone’s day
• Having the capacity to give
• The ability to choose what you do in a day
• Leaving your comfort zone
• Choosing love over fear

And the full list is here if you wanna check it out: https://www.feelingoodfeelingreat.com/2017/08/30/measure-success/