If you’re applying for a job in English, you need to make sure your cover letter is great. But writing well in English is very different from writing in French. Read my LinkedIn article for lots of tips to help you: https://www.linkedin.com/pulse/french-speakers-7-tips-effective-cover-letter-english-catherine-aygen
Practise your English every day!
You'll find lots of exercises to help you improve your English - listening activities, reading, advice and lots more.