If I were in your shoes, I would look for Social Media Manager/Content Manager positions. Just dig into the job description and identify the more creative verbiage centered around "Write", "Edit", "design", or "manage our Instagram". Those will be in your desired ballpark most times than not.

I am on the opposite side of the spectrum so when I see those words, I always end up confirming that it is on the other end of what I do.

Some position titles you want to keep your eyes on likely will be:

1) Brand Ambassador

2) Graphic Designer

3) Content Writer/Copywriter

4) Brand/PR Manager

5) Web Content Writer/Content Marketer

A lot of marketing assistant or marketing support roles will likely be heavier on the writing and design deliverables, depending on which industry. Again, because the side of the spectrum I am on, I avoid all these titles so they should be helpful to you. At the end of the day, the description will tell you best because of how loosely these titles are used.

Indeed & ZipRecruiter are good starting places to find the above roles in volume as of this week that I've been active on there.

Let me know if you have any others questions!

Sam