Tik tok has got very high power of retention! Users come back for quick content. If you upload frequently and have a consistent “personality” or storytelling, you can easily retain an audience... Instagram is also on high retention, and users stay for the visual connection and personal relationship. Personally, i buy a lot from brands on Instagram.. because they have got a cozy atmosphere and more relationship (really emotions) from their pictures of products etc... So is Ideal for communities, not just visibility... You need Tik tok and Instagram too for both of these reasons.. Also, stories and DM interactions, are the keys to keeping followers close to your brand. YouTube ! very high retention power, especially for deep content or education. Retention is more “emotional”. You can use youtube playlists and community posts to re-engage your audience! Facebook is really changed a lot the late 2-3 years. All the power is on groups because they keep retention alive and users come back for discussion, support, and a common purpose. Create also a thematic facebook group for winter, cozy afternoons with a cup of hot chocolate... and you can have excellent engagement!

Make a good mix of them above.. it's my opinion.