Assalamualaikum.
What measures success?
From what I think, the meaning of success itself differs to every person, in accordance to their
a) passion
b) expertise
c) purposes
and many more. Depends on the person themselves.
So there might be this A who have been married to their better half for 35 years and still going strong with them, and feels that that is a success. In marriage life.
And there might be this B who have discovered a new approach in fighting fatal diseases and feel very pleased with the achievement.
Or this C who won the most prestigious reward in C's field of work and rated it as the highlight of C's life.
While this D feels grateful of waking up from a near death experience, having another chance to.. if not making everything right then, a chance to make a better life, and if Allah wills, continuously being better and better, from here to hereafter.
Like I said, it depends.
And only you yourself can define your own success.
Because you wore your own shoes and you walk on your own chosen path.
No matter if you end up in a wide clearing or found an exotic circus,
it is all you.
Therefore, before I end this, let me rephrase the question.
What measures YOUR success?