Basics first: the grammar is a bit clumsy. Always read these things out loud to ensure they make sense and that you've got commas and full stops in the places for a natural break.
First sentence makes no sense. Second sentence is missing a word: "Not only have I seen...". Also, what benefits have you seen that make you a good fit? What can you, as an individual, do to make this difference to diagnoses? How does being a trainee BMS make a difference?
I understand I have no knowledge in this field, but that's why I'm pointing out these things, as to me the 'buzzwords' have been submitted without being fully supported. Sorry!