it's easy to write, that is, to let your leaders know about you and reflect the value of your work. So write down a few points:

1. What have you done? Be concise

2. Which of these things need to be solved with your personal skills or your personal brain, so that leaders can see that you are working with your mind. Even if there are no problems, you should write down the difficult problems and solve them through your efforts, without bringing any burden or benefits to the company

3. .

4. What abilities do you need to improve or what knowledge do you need to supplement in your future work, and you have started to do and learn.

just write these points.