I collaborated with our senior graphic designer. He gave me templates with the company's logo, colors swatches, and fonts so that I could do social images on my own and be on point with our brand's style guide.
We did this so that the graphic designer could be freed up to work on top-level projects. While I'm not a graphic designer, I know my way around Photoshop and Canva. I don't just write social, but I designed almost all of the social images myself. Some of the sales images with heavy graphics, our graphic designer created.