Such a personal thing! I have friends who are musicians, mums, doctors, lawyers, farmers, bloggers, one who's a priest, one who's a dancer, etc, etc. The musicians would consider themselves successful if they could quit their day jobs and live out of music. The doctors and lawyers would like waterfront and boats. The priest doesn't care at all about financial stuff. But they would all agree that the thing that brings them the most happiness is the relationships they have with their nearest and dearest.