I add almost everything we push to prod and try to use less technical and more use centred language. e.g - if we push out a tiny fix or feature I'll write about how it is useful for the users. Keeping it short and in bullet points under appropriate headers.
Not particularly about changelogs but these best practices help when building in public in general.
1. Consistent cadence - make it weekly or bi-weekly
2. Use gifs to showcase tiny features
3. Highlight big features with a loom demo
4. Keep copy writing short and sweet :)