What Should I Upgrade First for Smoother 1440p and Future 4K Gaming?

I bought my PC a couple of years ago while finishing college and would rather upgrade it than move to the next generation of consoles. I'm happy with the system overall, but I'd like to improve its performance, especially in Crimson Desert. My current setup is a Ryzen 7 7700, Radeon RX 7800 XT with 16GB of VRAM, 32GB of DDR5 memory, and a 144Hz 1440p monitor. I'm also considering buying a high-quality 4K OLED display eventually, but I'm not sure whether I should upgrade the PC first or what component to prioritize. In Crimson Desert, I've noticed frequent frame-time stutters and a somewhat hazy-looking image. I may also be dealing with poorly tuned settings, since I'm still learning how to optimize games properly. What would be the best first upgrade or adjustment?