If you liked The City of Ember by Jeanne DuPrau try another book in the Books of Ember series:

#2: The People of Sparks
#3: The Prophet of Yonwood
#4: The Diamond of Darkhold

or one of these:

The Fire-Us Trilogy by Jennifer Armstrong:
#1: The Kindling
#2: The Keepers of the Flame
#3: The Kiln

Neptune’s Children by Bonnie Dobkin

The Dirt Eaters by Dennis Foon

Epic by Conor Kostick

The Secret Under My Skin by Janet McNaughton

The Knife of Never Letting Go by Patrick Ness

The Dead and the Gone by Susan Beth Pfeffer

Unwind by Neal Shusterman