write hook one short line to understand the project you can do it, no fluff, this shows client you read the post
if you did any project releted to the job share its portfolio there
breifly explain your workflow how you will approch there project, with specific that prove you know the job, always include something you showing you can start quickly, or deliver fast
At the end write a polite short call to action close, invite them to share files, hop on a call, or confirm details so you can start with it ... Hope it helps you guys, Remember me in your prayers, Hira Fayyaz