Why is Terminus so unfair???

Okay, so be ready for a big rant because I am SO FED UP.

I have been stuck on Terminus for so long. EVER SINCE BO6 LAUNCHED BTW. I can survive the steaps for the easter egg just fine, however, as SOON as the boss starts, first attack, kill me instantly, even when I ACTIVELY dodge.

I know it's a skill issue, I know... I am not great and wished I was better, however this boss keeps showing me that the world is unfair. And I can't even have teammates because I am sure zero people actually play this game on MP, just solo.

I really don't know what to do. It's getting to a point where I almost threw my controller at my window in frustration.

So I ask you, what should I do? Relax or just quit and hand the gloves already?