我想提高英语水平，怎么翻译

I want to improve my English. 这样就可以

最直白的就是：I want to improve my english level/ability.
OR: I am desirous to improve my english level/ability.
在不同的场合说法也就不同了。有口语化式的，有比较正式的场合等等之类的分别。

I want to improve my English.

i want to improve my english.

i want to improve my english

I want to improve my English.