If you can speak English well: I am proficient in English. | Business English Yappi
If you can speak English well:
I am proficient in English. I have a good command of the English language. I am fluent in English. I can speak English with ease. English is one of my strong suits. I am comfortable communicating in English. I have a solid grasp of the English language.
If you can speak English not well but you are improving it:
I am still working on my English, and I am making progress. I can communicate in English, but I am not yet fluent. I am still developing my English skills, but I can hold a conversation. I have some knowledge of English, but I am working to improve my fluency. I am not completely confident in my English, but I am actively working to strengthen my abilities.