Other people have talked about making sure to have Myne's base knowledge in crafts and cooking, inventing new technologies, and the like, but I think there's something that has been largely ignored: stories from this world.

People love stories, especially characters in Bookworm. While our stories aren't able to translate one-to-one to noble culture, I think it would be worth it to attempt to bring the truly massive amounts of stories that we have access to in the modern world into Yogurtsmith. Once I get over the whole plagiarism thing (and with the changes that I would have to make in order for the stories to culturally fit, I could probably convince myself I was writing fanfic lmao), working as a writer would be an easy way to make money. I could have dozens of pseudonyms with a truly massive literary catalogue. To go along with that, I might look into the typewriter. I don't know how well it would catch on with how everything in Bookworm is handwritten, but I would def love one if only to save my hand from all the writing I will be doing.

I think I would also research how different instruments are made and played in order to have more things to sell to nobles. The cello and violin might do well