提高写作能力的英文表达是 "improve writing skills"。以下是一些相关的例句：

1. I want to improve my writing skills to become a better writer.

2. She enrolled in a writing class to improve her writing skills.

3. Improve my writing skill. Raise the writing level.

4. develop /gain/higheden one's writing ability make a progress of my

5. improve writing skills.

6. Raise the level of writing.

这些表达都可以帮助你描述提高写作能力的过程和目标。希望这些信息对你有所帮助。