I would like to see the exact same thing here as you did for Tweets previously. Even though they are the same content posted across channels, different content performs differently.
Post SCREENSHOTS of your five best Instagram Posts in Skool.
Go to LinkedIn, go to Analytics, and then see which got the most impressions.
Open up your five best performers, take screenshots of them and then put them in Skool in one thread with the screenshots as replies to the original thread.
I need to see what kind of Posts are working well for you.

You should be able to get here with this link: https://www.instagram.com/accounts/insights/content/
Post Your Five Best Instagram Posts - Month 3 · 10k Per Month Agency