I recently stumbled upon one KPI list covering most aspects of life. The idea is that you can only know if you are successful if you measure it. Whether you see yourself as successful or not could be pretty ambiguous. It ties much to what it means to be happy and what it means to be successful. Can you be happy without being successful? It all comes to what being successful means exactly.
I strongly believe that advancement in various areas alone is sufficient for happiness. Well, that is why we have these KPIs to measure our improvement. What would be the results of our advancement are hard to predict. Sometimes these results will be below our expectations, but as long as we advance, we should be happy about ourselves.
Here is the KPI list. I hope this comes in handy :)