You can not know it all, becoming a PRO is not one day job, you will have to put in a lot of interest and learn daily. You will get better with your experience, there will still always be something new to know.
there will be more knowledge but there is still something to learn because the more future you need to know.
learning has no limits, so being a Pro is not easy because the more we understand we will also need experiences that have not been mastered.