Hello I'm from Taiwan and I speak Chinese :) All you need to say is "我的中文正在進步中". In fact, you can just get rid of the character "正" cause other people would still know what you mean (improving) if you just said "我的中文在進步中" Orally it doesnt matter that much if you ignored "正" in the Chinese sentence of "My Chinese is getting better". If you just interpret word by word from English to Chinese, that would be weird and no sense (and too formal as well). Hope these could help ^___^

Improvement, often with "work" and "method" "technology" and other words collocation For example： in the teacher's advice, I improved my study methods. Improve, often with "life" and "relationship" assigned "conditions" and other words For example：We should try our best to improve environment

我的中文水平正在提高/我的中文水平比好很多了

"My Chinese is improving/getting better" 這句話 表示 狀態的持續改變 應該應用 "越 ... 越..." 句型 我的中文 "越來越好" 越...越... : 你越大越不懂事。 風箏越飛越高。 他的臉色 越來越難看。

我的中文水平正在提高。