Yeah, if you're continuing to fail the Zenos solo instance, it doesn't mean you're bad; it just means you're missing a mechanic you need to do. His ability 'Art of Sword' is a DPS check, and you are very likely dying to this one-shot. It is very similar to the mechanic of the same name when you fight him in the Ala Mhigo lv70 dungeon. Even with the difficulty at the lowest setting, that mechanic still exists.

As someone who also has a lot of difficulty with some of the simplest things, I know that your gameplay isn't necessarily a lack of ability to perform. There are so many things that can help assist and improve your gameplay drastically. As an example, your UI and Hotbar set up can seriously make a night and day difference. Your UI might be set up in a way where there is too much information being output, and it distracts your attention from where it needs to be. That is what sounds like is going on more than anything. Especially if you are missing mechanics.

It is players such as yourself why I get so upset when others trivialize the content. They seemingly have no idea players of lesser skill than them exist, or just dismiss them entirely. As difficult as it sounds, use every failure as a motivator to get better. If you can do so, when you overcome a challenge like you WILL with Zenos, the sense of accomplishment is huge, and it is how we are supposed to get our dopamine fixes. You have a great opportunity on your hands to acquire some delayed gratification, and I would not squander it.

Forward!