I'd say you should continue both "A good girls guide to murder" and the "one of us is lying" series.
From the looks of it, you enjoy murder mysteries, so here are my murder mystery recommendations:
- I know you did it
- The Cousins (Which is written by the same writer of One Of Us Is Lying)
- Pride and Premeditation (Which I only recommend if you are a fan of Austen's works)
- the maid
- We were liars
Now onto my YA recommendations:
-They both die at the end
- The fault in our stars
- The perks of being a wallflower (This is a favourite)
- The book thief
- All the bright places
- The sun is also a star
And my Romance recommendations:
-To all the boys I've loved before
- Any Colleen Hoover book that is classed as Romance
- Pride and prejudice (and pretty much every jane austen novel)
- Wuthering Heights