Why your cover letter is boring?
You should start with your own story, not with “Dear Sir”… Show passion!
In the book “How to find a job in 30 days”, I wrote a chapter about how you should contact companies by email. I suggest that you finish your cover letter with something like that: “I’ll call next week to talk about this…”
A lot of people are using the european CV model but… it’s not possible to stand out from the crowd if you use the same model as everyone. You need to use different models to stand out, to show your creativity!