The real problem
It was never that you did not want to post
Ask any owner why the shop has not posted in three weeks and the answer is almost never that they forgot. It is that posting means opening a blank app, deciding what to say, finding a picture, laying out the text, and then doing it again tomorrow. Each step is small. Together they are an evening.
So it gets skipped, and the page goes quiet, and the quiet is what customers read as a business that is not doing much.
The fix is not a better design tool. It is not having to start from nothing.
How Chitrio does this: Tell it about your business once: what you sell, who buys it, where you serve. Every poster, ad and video afterwards starts from that instead of from an empty box.