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i[avoid a comma before usage of but] ii[avoid any kind of attachment details or documents mentioning in the letter like this]
iii[yours faithfully-formal letters]
work more on explanatory sentences and highlight more points to frame the content with appropriate. sentences. Grammatical errors needs to be taken care of and work on task response n terms of content length/add more of lexical words to have a balanced explained content
well tried.keep writing!!!