As someone that taught English as a foreign language in Spain for two years, I think I’m qualified to say you’re written English is very, very good. My students used to struggle with writing, especially when it came to producing a lengthy piece. They would have struggled to write what you have here.
You should take encouragement from the fact you can write so eloquently in a second language. I know plenty of native speakers, who would not be able to express them and write with the fluency that you can.
All I can say is that you certainly do have a place here on Medium, and your voice is no less valid, just because English is not your native language. Keep on writing and producing great content! :)