"I can assure you I have more capabilities than I currently present to anyone, including my employer" "please advise me on how I can begin to impress my employ

"I can assure you I have more capabilities than I currently present to anyone, including my employer" "please advise me on how I can begin to impress my employer and prove to them that I am a capable employee"..... You have the answer right within your text.... present more to your employer (more of the stuff you have that he/she cant see now..) Go the extra mile in all tasks.