The biggest mistake people are easy to make, is to think working for others, not themselves. In fact, from the first job you get, to your retire. We are working for ourselves.Taking a long pespective, it is youself that decide the benefit. Usually, because you do something or produce some product, then others will be happy to pay for this. If you want to get higher payment, you should make plans, increase your investment, because basically your competition advantage willl decide on your living quality and the material income of your working.
So you must ask yourself several questions: what is your competition advantage? According to the trend of this field, what is your advantage for future 3 or 5 years?
There is one way to prove how wonderful you are: do people have a big need for such a talent like you? If it is, the employers will try to take you away.