1- you can find a native partner to practice with so that you could hear and practice the right accent 2- you can get a paid teacher. 3- you can watch movies or TEDx talks these will help with improving your listening skills and will help you with the accent and intonation, but of course if you wanna improve the speaking without talking with natives you gotta try to sing or to repeat what you hear in movies or TEDx while recording for yourself then listen again and compare between your speaking and the song till you are able to pronounce the words with a right accent and intonation. 5- if you want to improve your writing skills you probably have to write essays and then you can correct it using a site like https://app.grammarly.com/ . or you can write notebookes here on italki and others will correct it for you. Good luck and hope this helped you.