Thank you for help and advices !
I'm going to change some things rapidly as you described it

I had a lot a difficulties to make it "massive", and I know i can have more dynamic, but i've used a lot of compression , i'm now searching where I can really optimize them as it's not always efficient.
I'm using some jbl 4326 monitors which are very nice but I think they deliver a bright sound and sweet tempered bass, that I must be careful with them, I don't have those monitors since a lot of time, my ears are not trained enough with them

The 1st part of the vocals has been recorded with an akg c4000, but all the others were recorded with an sm58, we can clearly ear the difference.