How to build a GMB content strategy for a local client?

Let´s suppose you guys have a local client running carpet cleaning services in X county.

You already did your job optimizing their GMB listings but something they lacked off was regularly posting.

So, this is why I come here for a few guidelines.

How do you approach a client when working on developing a content strategy for sort of to re-launch their not-so-active GMB listing?

Thanks in advance!

Cheers and stay safe!