I used to use it for research / “steal” the good content of other pages and use it on mine. Once you have content that has been proven to work, it is much easier to engage with your audience instead of trying to create something new and hope for the best.
I still have that WP plugin called FB Post Bot that I used to use, but it doesn’t work anymore and the dude that I bought it from seems to have closed down business.
If anyone has FB coding experience to update it and make it work, PM me and I can send you what I have. From my limited tech understanding it just needs updating as some of the stuff is from 2015 and FB has depreciated it.
You can try using iconosquare.com for the type of analytics you are looking for (and much more)
It has a free trial for a few days and when that expires just make a new account if you don’t like it enough to buy a plan with them.