I need help finding a book for my friend's friend!!!

[Dragon Queen]

My friend just texted me asking what book they should get for someone that likes Wings Of Fire, I haven't read the series in YEARS and can't think of anything, I was going to say Fourth Wing but I don't know if they read romance so that one is out of the question. I tried quizzing them on the person but they know nothing, I asked favorite quote, nothing, I asked genre, they know nothing. I'm stuck on this one.

[autumn (college hiatus)]

do you know how old they are? that might help