Some advice that I will give u is definitely learn your major, minor, and blues scales in every key. This will help your fingers to strengthen and get faster. Also, it will get u more familiar with keyboard. Next, learn as much music theory as u can. Try taking some college courses or just look through this site. For example, learn about the different types of chords like major, minor, diminished, etc. Instead of learning how to play songs, learn how to play progressions because those will help u play a varitety of songs and not just one. Plus, it is easier to transpose. Finally, listen and watch other musicians who u consider more advanced than u. Try to mimick what they are doing, but put your own spin on it so that u can develop your own style of playing.