第一部分:说明写信目的
You have asked me for some advice on how to improve … . I will try to give some useful suggestions .
I am writing to you to present what I think on the further improvement of … so as to …
I would like to make a recommendation that …
I am writing to advise you of …
第二部分:提出建议
I'd like to suggest that …
May I suggest that …
Could you please …
Why don't we …
In my opinion …
I feel that it would be beneficial if …
第三部分:期盼回复
Thank you for your attention .
Please take good consideration of my advice . Thanks .
I trust you will take my suggestion into account .
I hope that my suggestions are helpful for your decision-making anyway .
I hope you will find these suggestions / proposals / recommendations (建议) helpful / practical / useful (有帮助的,实用的) .