Hello.
Whether it is proficiency or high-quality writing skills, I meet all your requirements thoroughly. Even though I'm not a native writer or the most skilled when it comes to wittiness, I can write engaging & entertaining blogs without going over the top.
But I know that you may ignore my proposal without even thinking it twice for being a non-native. That happens more often that I would like to admit. But that doesn't mean I'm a lousy writer. Actually, it makes me a thriving writer that although he doesn't have a perfect language, vocabulary or writing skills in his second language, he's still good enough to deliver outstanding work.
It's all about giving me the chance to prove myself. The opportunity to provide you with a taste of my excellent skills as a writer, and probably will surprise you with a few witty lines (you won't be able to read them until you hire me.)
My focus has always been to impress my clients in every endeavor, not only because I adhere to deadlines well or because I have a great responsibility, but because I can write like no other non-native writer out there.
You won't lose anything just for trying me, actually. If you are willing, I can even write that sample and receive no payment if you don't like it. So there's practically nothing about me to dismiss.
Want someone reliable, useful, punctual, and skillful? Then don't waste your time and give me the chance to show you what I'm capable of. You won't be disappointed :)