Sorry, but as a full service I only offer copywriting in my mother tongue. Although my understanding of the language is excellent and effortless, putting English into practice as a writer and creating a professional English text is a different ball game.
I feel I cannot serve you properly in this area.
Having said that, what I can do for you is find and/or (re-)write easy to read content that might be interesting for your customers. This is limited to doing research into useful material and subsequently creating a concept article for you to review.
However, I recommend you have a native professional edit and correct my text. The English used throughout my website is of my own making and as good as it gets.