Start with high-confidence modern philosophy books, then narrow by subgenre or adjacent topics.
The Present Age
Soren Kierkegaard, Søren Kierkegaard
Situating Existentialism
Jonathan Judaken, Robert Bernasconi
Culture and Value
G. H. Wittgenstein
History of Western Philosophy
Bertrand Russell
On the Genealogy of Morals and Ecce Homo
Friedrich Nietzsche, Walter Kaufmann
Humanly Possible
Sarah Bakewell
Nietzsche
Stefan Zweig, Will Stone
The Hatata Inquiries
Zara Yaqob, Walda Heywat