Here is a simple template you can use to write an advice letter to a manager.
Subject: Advice Regarding [Enter Topic]
I am writing this letter to bring to your notice [enter topic]. The company has helped me learn a lot of this and enhanced my professional capabilities. I, however, would like to recommend some ideas to enhance the prospects of the company.
I would like to suggest [enter advice]. I also recommend you look into other suggestions as well. I hope that you will take this in a positive way. I will be pleased if this letter helps you in any way.
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