Here's some ideas from my to read list - maybe add whatever theme is lacking so far?
The Electric Kingdom - David Arnold (it sounds dystopian & post apocalyptic /sci fi)
or
All the Good Things - Clare Fisher (?any relation, Karen?) - sounds kind of heavy but contemporary & about hope or redemption but harder to categorise
or The Fixer- Claudia Carroll (sounds lighter & Sophie Kinsella -ish)
https://www.amazon.co.uk/Electric-Kingdom-Professor-Emeritus-History/dp/0593202228
https://www.amazon.com/Good-Things-Clare-Fisher-author/dp/024127575X
https://www.amazon.co.uk/Fixer-must-read-bestselling-Claudia-Carroll/dp/1838773924
(Sorry about the Amazon links, all the Google Goodreads links kept opening in the Goodreads app on my phone & I couldn't find links in there)