20th century historical fiction

Hi guys wondering if you could suggest me a book based around ww1 and ww2 I’ve read the following: all the light we cannot see, nightingale, city of thieves, catch 22, slaughterhouse 5, century trilogy, the winds of war and also memoirs like forgotten soldier, with the old breed, helmet for my pillow and storm of steel and just wondering if anyone has any other excellent books they could inform me on!! Got a two hundred euro voucher that I’m gonna treat myself with some books so any recommendations would be appreciated 🙂