That's true man, I realized the long list of mistakes right after I uploaded this.
My recent experiments in music are going great and sooner or later I'll post something stunning XD
I'll try to do another version of this song some time this year :)

Ha! I'm not a great musician just an amateur. Here's my secret -OvO- if you're interested and if you use fl studio too:
Apply the gross beat effect to the whole song.
You play the song and in the gross beat window you will find a bunch of audio effects, click them each 1 beat or 1 bar of the song, et voila monsieur :>
Last thing is to automate the whole process and you're done.
Thanks for the kind words :D

Thank you ごOh!d sir :D

Yes, I agree with you. I was following some tutorials this week and I realized most of my mistakes. I was doing my tracks without big interest in musical theory. Now I understand the use of the mixer and especially the parametric eq 2, my best tool to shape the sound waves :D
Thank you friend :)