PS5 Plat Trophy

Hiya folks. I’ve just redownloaded D2 to finish up like 2 trophies I never finished, and really just want to snag the plat. I’m missing trading with Xur which is no biggy, but the other one is completing a nightfall mission on grandmaster. I haven’t played D2 since the max light level was around 410… Would anybody be willing to help me out with completing it?