Hi. Curious if you attended a US government class?
I have 10+ years experience in education and career services and 2 teaching ESL so there are a few issues with those examples.
It’s a little hard to rewrite specifically without knowing the context but assuming some basics it could be something like this
ex 1 I am passionate about marketing and believe you need a strong candidate in the role of assistant manager to help ensure client satisfaction etc....
ex2 your marketing analyst position is an ideal platform for me to acquire skills necessary to succeed in that role