Excellent post, and good on you for persisting! Everyone is capable of getting through any level of content in this game if they practice and work on improving. I started playing in late Heavensward and honestly, I sucked. It took me a month to clear Susano EX when it was new and that fight wasn't even that hard. I would later go on to keep practicing, reading up on how to be better, watch videos, etc. would clear every savage tier on content from E1S to P12S, clear 3 ultimates and have plans to clear the other 2. I still struggle sometimes and I'm still really bad at very specific types of mechanics, but I think I'm pretty okay at the game now.