Change life for better?Absolutely depends on whether you are happy or not.
Life is Good (True)
Better is Good (True)
What is the meaning of life? (Universal question)
What is the meaning of better? (Easy question)
How should I live better? (Straightforward yet complex question)
How should I live life? (Complex question but less straightforward, the answers would have a lot of overlap)
Change life for better? You can if you want, you get slightly different meanings but don't let anybody tell you that you can't.