Dear XX,
I am Lin Wang and I've received your letter already.And now I want to discuss my opinion on XX (content of the mail).
First of all,I think (Suggestion in content number one) will be helpful for you.Secondly,you may also consider (The recommendations in content number two).Last but not least,If I were you,I would go with (Suggestion in content number three).
I hope these recommendations will help your situation(或用 will help your case).Looking forward to hear good news from you soon!All the best and good luck!
Sincerely yours,
Lin Wang (英文是先写名字,才写姓氏)