Whenever someone asks me "I'm just getting started with posting content on social media; what should I talk about?"
My answer is: What are the top 3 questions that you get asked most frequently by friends/acquaintances/colleagues? Turn those answers into videos/posts. Just say it like how you said it to them in real life. That is your positioning.
If you have repeatedly said something for >3 times, it's worth turning into a video
One of my initial motivations for posting on social media was because I was tired of repeating myself in real life