Hello, Sherehan!
It sounds like you have a terrible job. It's good that you're trying to do something about it.
To post here, the first thing you should do is check the member information you gave us. It doesn't look like your native language is American English.
Here are some ideas for improving your letter:
1. Go back over your letter and break the paragraphs into sentences. The sentences should start with capital letters and end with periods (also called full stops).
2. Separate your paragraphs either by indenting their first lines or by putting spaces between the paragraphs.
3. Shorten the letter. For example, apologizing for the letter's length just makes it longer.
Those changes can make it easier for us to help with things like grammar, word choice, and punctuation.

Student or Learner