Everything stored in daily notes, how to filter?

The other method is using the DataView plugin with plain DV and DVJs queries.
The latter is more flexible and can be used to extract content.
Otherwise you would need to organize your content with list items, as mentioned in this thread:

The newer OpenAI 4o (Plus) robots seem quite handy with generating DVJs code so once you whomp one together that works, you can reuse the same script and make some changes (with filtered folders, etc.) as needed.