How to improve your native language (that you're starting to forget)?

well, i like the website sharedtalk.com, it's a language learning website where you can talk to people all over the world, and there are many mandarin native speakers. I'm sure you can talk with them, either typing or, if you want to speak to someone, the site has a voicechat option (I personally have never tried it though.) i think it's a helpful website for learning languages as you can practice with a native, and help them with english (or whatever language they're trying to learn.)