There is a formula if you wish to follow it, that will get you lots of likes, followers and make you popular, but it lacks any soul, meaning, or purpose. It adds nothing but more noise to the continuous human story that we can all add to. Fluffy cat pictures still work, by the way.
It’s not about finding a big audience, it’s about finding your voice and finding something that you really want to say, something that will add to the ongoing human narrative.
There might not be a huge audience straight away or ever, but with patience and sticking to what really matters to you, it will resonate with the people who really care about what you care about. You can become a shining light for them to follow.