This is not a simple question because success means different things to different people. For some it will mean running their own multi-million pound businesses and for others, earning enough money from work to fund what they really want to do. For me it meant earning as much money as I could in the time that I was prepared to spend at work so I had enough money to do the things that I wanted with my leisure time.
The key questions is what does success mean to you? Only you can answer this and you must, otherwise you will not know whether you are succeeding or not. Don’t set your goal based on what other people define as success.