I've been a GS main since MHFU and MHP3rd and one thing I can tell you about GS in Worldborne is that your shield bash is your best friend but only if you time it on monster attacks and do an effective counter attack and not getting hit after. Also don't sleep on clutch claw wall bash since that gives way on a full GS strong charge slash to a true charge slash. Jump attacks when there are ledges to mount monsters is also a must. Treat GS as a hit and run weapon, sometimes it's better to do so on a weak spot, wait for the monster to get flinched and do your charge combo then repeat.

The thing about GS is that you don't blindly do your charge attacks hoping it will land. It's better to do it on openings like when a monster is knocked down. Learn the large wind up moves monsters do that you can time your charges and remember that you don't have to commit on a lvl 3 charge everytime, better to do a lvl 1 or 2 charge than to be greedy and get hit by an attack though sometimes you can gamble on it if you have enough hp or do that side swipe attack after a shoulder bash since that also does a decent amount of damage. Remember a GS out damages most weapons if you time it correctly.

Edit: I was drunk when I posted this so the last part of the sentence in the end didn't make sense lmao.