You'll have to upgrade your PC, it's just a graphics upgrade to reach the level of detail of a Ps4 Pro generation game in truth.
It's barely on a par with Ghost of Tsushima +/-.
A mini graphical upgrade of a Ps3 MMO
It's good to have RAM, which costs nothing these days, but at some point you have to upgrade your CPU too, it's not enough.
And probably get a non-original Cooler, from a brand known for their cooling systems, because the basic Cooler is just not good enough...
https://na.finalfantasyxiv.com/system_requirements/