I was lucky enough to join an AI group with the great Sabrina Rominov who created Blotato.com. It's a great platform for social media content creation. It reminds me a bit of NotebookLM if notebook LM could turn the info from it's sources into social media posts.
Blotato will make your own creative, but I'm really like the creative that Google's new Pomelli is making me! https://labs.google.com/pomelli
It really understands branding and sleek designs. Take a look!