if you tend to like that book I would highly recommended Walter Kaufman's Existentialism from Dostoevsky to Sartre and Goethe, Kant, and Hegel
Second this also. Also enjoyed Will To Power as a kind of well of "things well said, which make you think, " even if they're not strictly correct.
Bertrand Russell wrote a lot of very accessible Western philosophy overview or survey books which I found orienting:
https://www.thriftbooks.com/w/a-history-of-western-philosoph...
and
https://www.thriftbooks.com/w/the-problems-of-philosophy_ber...
the former is online here:
http://www.ntslibrary.com/PDF%20Books/History%20of%20Western...
About this one he said :(paraphrasing from memory now), "A big book is a big evil. You may ask why then the author proposes to lay before you the present work..."
He's a hoot.
Just started reading
At the Existentialist Café: Freedom, Being, and Apricot Cocktails with Jean-Paul Sartre, Simone de Beauvoir, Albert Camus, Martin Heidegger, Maurice Merleau-Ponty and Others by Sarah Bakewell
It has a really nice narrative and tells the story of the aforementioned. Kierkegaard also makes some occurrences.