i have also witnessed the same situation with facebook pages.in some cases, increased posting may not be helpful.u could start by identifying the types of postings that were more engaging in the past nd include similar content.furthermore, concenttrate on responding to comments nd posting content that prompts intteraction.it is advisable to implement several alterations and identify what is working.
At tymes the audience is not gone but they hve stopped looking for reasons to engage. What i would try is posting things that requeires opinions rather than some thing viral to earn likes.
It might help to revisit which posts used to get the most interaction and build new content around those topics instead of simply increasing how often the page posts.
Try changing your content format, posting more Reels, and testing different posting times. Also check Insights to see which posts lost reach and what your audience still engages with.
