Among my strengths is my determination to get the job done, my ability to focus, and stay on task.

[Zoli]

Does "Among my strengths is my determination to get the job done, my ability to focus, and stay on task." sound natural?

 

[Barque]

You need "... my ability to focus, and my ability to stay on task" or similar words.

Alternatively: Among my strengths is my determination to get the job done, and my ability to focus, and stay on task.