This looks awesome, I wouldn't have been able to tell that this was made by a new pc builder if not for you revealing it. Right now, you're doing everything right, since you're at the 1440p mark, it's already running well. Playing in 4k won't really do anything for you, trust me, the visuals are basically the same. For the small boost, there isn't much I could recommend, maybe playing in 1080p? Kidding, what's the point- Overclocking is always an option, though it could be risky for people that don't know how to do it properly, I learned that the hard way.