If you want an ordered list of every publication since 2018 you're probably not going to be able to find that. Most people write up reading orders to hone in on a topical focus; if someone wants to read everything, just do it in publication order.
This website has a variety of proposed reading orders for different topics:
https://www.trackofwords.com/?s=reading+order
This list is most of the "moving the metaplot forward" content:
https://www.trackofwords.com/2021/01/10/black-library-new-40k-reading-list/
The Watchers of the Throne series is the best setting-advancing series, for me.
It might be fair to consider the Dawn of Fire series the "main" setting-advancing series.
Campaign books and codexes will usually have the most condensed, pure jet fuel lore.