You can increase your earnings or you can increase your earning potential. In the short run, it might boost your ego to increase your earnings. In the long run, increasing your earning potential will have a much more significant ROI. In many ways increasing your earning potential is about planting seeds today for who you eventually become.
You increase your earning potential not necessarily by choosing the opportunities that pay the most, but the ones that cause you to grow the most. – Srinivas Rao