A good letter guides the recruiter through your application and explains why your profile is worth exploring.
Indicate the role or area of interest, avoiding generic formulas. The reader must immediately understand the reason for the contact.
Do not rewrite your CV: choose two or three strong elements and connect them to the position, sector or company.
An effective application says what you can do, but also why that opportunity is coherent with your path.
Thank the reader for their attention, leave your contact details and state your availability for an interview or further discussion.