Does anyone want a “cozy” story about the grief of disappointing your friends, and the agony of saying “no”?
Maybe it's my age, but I think I can always deeply appreciate a story centered on the idea of a change in life direction--there's a job that's consumed you to the point of you making it your identity and suddenly it's taken away from you (see: Bujold's Memory), or where a fulfilling job that your family and friends all expect you to do that has lost its luster, or when you've been doing the same job for hundreds of years and who would you even be if you weren't doing that. I am just a sucker for stories about new directions.
It's not that Viv wasn't changing her life in Legends & Lattes, but she wasn't really struggling against herself: she knew she wanted to hang up her sword and open a fantasy coffee shop. It doesn't quite resonate the same way as Fern's struggle does in this book, and it makes this book much stronger. Honestly, I most appreciate that this Travis Baldree book has an answer to the "how do I change my life when it's not working" question that doesn't end directly in fantasy small business. I also appreciate that Astryx and Fern are both thematically struggling with their own relationships with their own work, and have different answers to that question.
This is still a fluffy story (and if L&L wasn't your thing, I don't know that I'd recommend this one to you), but this is absolutely the strongest book in the trilogy for me.
Additional minor rambling:
Because Zyll is an uncontainable goblin menace and Astryx is on a hopeless quest to contain her while somehow bringing her to justice, it creates a nice plot dynamic. Astryx doesn't have to be the terrible mercenary out to get a bounty on a loveable side character--it can be comic relief where Zyll escapes her bonds but then comes along anyway. It removes some seriousness, and makes it more about the relationships between the characters. And, Zyll at least gets some explanation in the end for her behavior, so it's not entirely fluff either.
(I think also you might want to have read Goblins & Greatcoats to get an introduction to Zyll and the titular breadknife. It's not that important, but it also makes that appearance of the titular breadknife even more random without that morsel of backstory.)
If I had any negatives, it's that I still squint so hard at the economics of this world. The threat in this story is that friends will be disappointed in you. There is very little worry around the fact that you (and your friends) have invested huge amounts of money in opening a bookstore business in a new town. In some ways, I feel like the small business capitalism aspect of these books undermines the cozy flavor that it's going for. I think there's just a dissonance to me where concerns about money are brushed under the rug and there's an assumption that everybody and everything will be fine without any worldbuilding or explanation for why that is.