Can you explain a little more about this please? Maybe an example of what should be avoided and how it should be done properly?
Facebook and other are for reach and PR. You're speaking mostly to people who are already clients and trying to spread your posts for maximum engagement.
Google Posts don,t spread. there's no social aspect. they're basically announcements. If someone is looking somewhere they might see your GBP post, they're already interested in posibly being a client. Use the posts to do that last push that might hook an hesitant customer with offers, seasonal reminder with CTA ("Hey, you have to book in advance for next season's snow removal/lawn care/tune up/whatever"), etc. In Quebec, early early July is
EXTREMELY busy for movers and you genuinely need to schedule months in advance if you want your chosen movers to be available.
Forget things like "happy new year", TGIFs(yes, I still see those from businesses on Facebook) and Did-you-Knows. That's for Instagram and Facebook. If you could put a custom pop-up reminder on the website that can be changed at the drop of a hat with no effort, what would you put there? That's what you put in Google Posts.
Personally I also like "we finished a great job" (especially those with before/after photos) and other success stories, but there's not been much written on the actual efficiency of this specific sort of content on GBP posts.