Matt from Matt vs. Japan kindly nitpicked my English last year. I meant to come back to it to learn from his advise and I finally did.
His advice was to combine words a bit more with expressions like "it is." I can say "it's" instead. I tried to do that in this video.
Thanks Matt! (Matt's account is: https://twitter.com/mattvsjapan ). He also has a youtube channel called Matt. vs Japan.