Oh, the KRK Rokit G2s! Solid choice for studio monitors, but I totally gather your struggle with the low-end. It’s a common hiccup with these. First up, checking your EQ settings is a great start. You might want to try rolling off some of the bass by adjusting your EQ slightly below flat in the lower frequencies. Sometimes what we perceive as muddle comes from too much boominess.
Placement can also massively impact how sound frequencies behave in your room. Make sure your monitors are not directly against walls or corners where bass can build up and get muddy. Ideally, keep them a few feet away from walls and try to have them at ear level for the most accurate sound representation.
Another game-changer could be investing in some basic acoustic treatments if you haven’t already. Adding bass traps in corners and some broad-band absorption panels at first reflection points can dramatically clean up your overall sound by reducing unwanted reflections and standing waves.
Experimenting with these adjustments should give you a clearer, more defined low-end. It might take a bit of tweaking to find the sweet spot, but it’ll be worth it!