Respected Sir/ Madam,
My name is _______ (name) and I am working as _______ (designation) in your reputed company for the last ______ (mention duration). My employment id is __________.
I have been working for a very long time with complete dedication anyhow I have not received any upgradation in my profile. I write this email to request for promotion. ________ (mention your point).
It is to request you to kindly consider my request and offer me a promotion. I shall be highly obliged.
Yours truly,
[Digital Signature]
____________ (Signature)
____________ (Name),
____________ (Contact details)