whalecum to the forums.
im not sure but this should belong in one of the upload sections.
your edit has some major quality issues. first it seems to have bad audio quality in general (try to get high quality files, in best case lossless and render in highest quality possible for yt (should be around 380kbit/s aac but not sure)).
then you clearly only changed the pitch without considering the speed. audio works over frequencies. the higher(faster) a frequency is, the higher is the tone.
that means you will get a timestretch effect by changing the pitch only and you dont want this.
also nightcore has to sound like hardcore, otherwise it doesnt deserve the core. yours sound like some mainstream pop or smth.