Mr. Darcy could be one of the people who help her. He has wealth and connections, and his affection for Elizabeth might lead him to support her investment endeavors. He could offer her advice on which ventures are more likely to succeed based on his knowledge of the business world.
Well, it's hard to define the 'best' as it depends on personal taste. However, 'A Baby in the Bennet - Darcy Household' is quite popular. It delves deep into how Lizzie and Darcy's relationship evolves with the arrival of the baby. It shows their growth as individuals and as a couple. There's also 'Darcy's Little Heir' which has an interesting take on how Darcy's family heritage and values influence the upbringing of their baby.
Bennet's War is most likely a fictional narrative. Usually, such stories are crafted by the imagination of the author to engage and captivate the audience rather than being based on real events.
As of now, the Genshin manga is not finished. The story is still evolving and there's more to come for fans to enjoy. The creators are taking their time to develop a rich and engaging narrative.
There's no definite answer yet. It might continue if there's enough demand and the creative team has more story to tell. But it could also stop if they feel they've completed the story arc.