The grid is the proof, the Reel is the introduction
A stranger usually meets you in a Reel. They follow if the next tiles look like the same show. Mix in carousels and photos if they serve the same person. A random selfie between tutorials makes the follow feel like a gamble.
Reply to comments and DMs you can actually keep up with. Collaboration posts work when the other person’s audience wanted your topic, not just when they have a bigger number.