I see a lot of cover letters that open with some variation of “If you are looking for a dynamic professional who can XYZ, you’ve found the right person.”
You must stop this.
It is salesy, it’s incredibly over-used, and it signals to the reader that whatever follows is likely to be boring and stilted too.
Get rid of it.
If you need an opening line to help you start writing, try something simple and straightforward, like “I’m interested in your XYZ position because …”
Seriously, you don’t need to be in sales mode. We don’t want to feel you’re selling us. We want to feel like you’re talking to us like a normal person.
(Also, you should stop calling yourself a “dynamic professional,” because who talks like that? And it conveys nothing of substance.)