If you like to read historical fiction set in ancient times, then I would recommend the book His Majesty, Queen Hatshepsut. It's about the real-life 1st female pharaoh in Ancient Egypt, from her childhood to her death. She is forced to go to school, she marries someone who she hated, she made enemies, she made friends, there's tragedy, there's happiness, she fell in love- anyways, it's really good. I forget who wrote it.

Oh, fun!! I have a few books I think are less known that I'll swing by to talk about later. 

Endling by Katherine Applegate is really good, plus it's a trilogy.

I've also read the first book in the Disbanded series (forgot who wrote it), and it's pretty good. it's about a civilization of snakes and their rodent servants, and the snakes have telekinetic powers. NOTE: some of the Disbanded characters occasionally use language that is generally frowned upon to use casually, so if you don't want to be reading that, I don't recommend it (still a good book though). you have been warned.

I haven't read any of these recently, because I didn't have time for reading, but I think these are lesser-known.

1. Orphan Island by Laurel Snyder. It's a very friendly, almost picturebookesque, heartwarming book about nine orphans living on an island without any adult supervision. Every year, the oldest of them leaves, and another kid replaces them. And this continues as an endless cycle, until one day, one of them doesn't want to go. Some of the book's themes are growing up and letting go of things. It seems to be saying that it's impossible to hold onto something for too long.

2. The Wolf's Curse by Jessica Vitalis. It's a fantasy story about a boy whose life is in danger because he can see a magical white wolf who's believed to be dangerous, and he thinks she killed his grandpa. I don't want to say anymore because I don't want to spoil it. It's written really well, and the style is so unique. Part of the reason why it's unique is because the point of view of this book is really interesting...it's written in first person from the perspective of the wolf but with an omniscient point of view. One of the themes is death and grieving, and how it affects you.

3. The Counter-Clockwise Heart by Brian Farrey. It's another fantasy story about a boy who has a clock that's started to run backwards in his chest and a cryptic prophecy foretelling his death (as well as a jealous advisor after his life), a girl who is fiercely loyal to her community of magic-users, called Hierophants (and the magic system is fairly well developed in this book), and a mysterious statue that appeared in the middle of the town one day. It's probably the most page-turning of all these books, and the most fantastical.

Another great book is Charlie Thorne and the Last Equation by Stuart Gibbs. It's mostly spy/mystery, but there's also some historical fiction and sci-fi. idk, I'm bad with genres. Anyway, it's about this super-smart girl- Like, she's smarter than her college professer- who is hired by the CIA even though she's only 12 to find an equation that Albert Einstein discovered. The United States wants it because it is the key to nuclear power. With this equation, the US would have power over the rest of the world. Anywhoo, it's a really good book.

I’m not sure if this is actually lesser-known but it’s super good, a book called A Place to Hang the Moon