https://www.amazon.com/dp/B082VXPZ6M
I didn't see a name other than MLT on the amazon listing, but I could be mistaken. This author posted this book to the thread somewhere down in the comments.
You should check out my book series: Stages of Earth! I'm a female author and the first book "The End" features a healthy cast of female and male characters ranging from 18 to 60- something years old. While there is some romance, as four of the characters are married, it's not the focus of the book.
In this world, portals open up and occasionally dump hellhounds, vampires, and other monsters for humans to deal with. These beasts have been successfully held back and kept hidden for centuries...
Until Monica fails.
Now a group of misfits have to work together to fight off the hordes, kill the vampire, and shut down the portal before it's the end of the world.
I'm currently writing the second one, Interlude.
Ah then. Maybe I can assist you. Here's the Amazon link. And thanks much for the list. It's given me books to hunt for. In a different time I would have LOVED to own a bookstore. 2 books in series aimed for ages 12-18. The series is called: The End (Stages of Earth Book 1) https://www.amazon.com/dp/B082VXPZ6M