You have asked me for some advice on how to improve … I will try to give some useful suggestions.

You asked for advice concerning (with regard to)… and I will try to make some suggestions.

I have received your letter saying… I recommend that…

I am writing to you to present what I think on the further improvement of…

I am writing in reply to …

I am writing to express my views about …

I would like to suggest that…

I would recommend that…

结尾常用句式

I hope that my suggestions are helpful for your decision-making anyway.

I would be more than happy to see improvement in this regard.

Thank you for your attention.

I believe that you will take my suggestions into serious account.

Please take good consideration of my advice. Thank you.

I hope you find these suggestions/proposals practical.

I would be ready to discuss about this matter with you to further details.

Whatever you decide to do, good luck with your studies/work!

其他常用句式

I feel that it would be beneficial if…

If I were you, I would…

You may consider doing…

It would seem to me that you could…

As you may agree that…