“to found out what is morality and ethic.”
This is absolutely key. I am glad you discovered this early on. These important philosophers waited to late in their careers, when they fully grasped the approaching horror, to turn to morality and ethic, so to speak.
Sartre (interview with Benny Levy)
Gyorgy Lukacs (from Lask through N.Hartmann)
Hilary Putnam (book, The Fact Value Dichotomy)
Most relevant for you may be the philosopher Alasdair Chalmers MacIntyre https://en.m.wikipedia.org/wiki/Alasdair_MacIntyre MacIntyre’s position is, more or less, that like it or not we start from Nietzsche today.
One question may be, is the Nietzsche who is popular actually a good representation of Nietzsche and his work and thought, considered as a whole? Probably not. The public is really in no way up to date on Nietzsche scholarship. Neither am I, but I know this.