I can't do this Quest

Whisperwind realm, Badlands, Dark Portal, Echo of Guldan for BFA. I try, and I do very little damage, I fought him and he just keeps killing my toon, Not fun, Not enjoying this. Can I play the expansion without doing this Quest? Is it required to advance? And no it is not this toon, I can’t switch toons in the forums it is on my now level 63 Horde Shaman Milmoe. Any advice?