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Have you looked at WordPress?
I don’t know, because I haven’t used it. But it seems like it offers the service you are looking for.
I have pointed you to the most commonly referenced resource for pre-built web pages. I highly recommend you check it out. But no, I cannot guarantee that it offers exactly what you want, because only you know exactly what you want. Again, take a look at it and see if it fits your needs. If it doesn’t, tell us why and we can narrow down the suggestions.
The best one I’ve used is “Divi”. It’s a plugin that allows you to create themes within WordPress.
It’s built by the amazing people from https://www.elegantthemes.com/
Check it out.