Quarterly newsletter and social media posts

A quick background on my company: I'm a 3D Designer who produces 3D Architectural Visualization Renderings. My clients are architects, builders, developers, interior designers, real estate agents, and homeowners.

I would like someone to produce quarterly newsletters for me. I would like to engage current and prospective clients. I have a client list, but it needs some updating. I can provide that updated list soon.

I currently post to social media (Instagram and LinkedIn) once a week. I think 3 to 4 times is more ideal as I have enough content to show.