Cover Letter Help Needed, Pls

I have a solid resume and have been in the industry for around four years (EA —> Asst editor —> Deputy editor) but for the life of me, I can’t write a coherent “look at me!” cover letter.

Does anyone have a sample handy so I can check it out and tweak mine accordingly? I mean a really good one, not one of the standard, useless online template types.

I’d appreciate it and definitely owe you one. Many thanks!