You have fiction for young adults, as well as “educational” non-fiction, but not many books that deal with current topics or serious adult topics like, finance, marketing, philosophy, etc.
Publish books on subjects that matter today – the same topics adults find interesting and read about – written for kids.
Have peace of mind. Know when my kids are not where they are supposed to be.
Have an app installed on their smartphone (whether you tell them or not is your decision) that can take your remote commands. When you know they are supposed to be with a friend for a certain amount of time you define the time frame, the location, and radius. If they go out of the radius within the time frame allotted, you’ll get an alert and can see where they are currently. Can also be used to signal you if they are supposed to leave and they are still there 🙂