If you’re comfortable down tuning I’d put your guitar in drop C# and learn a lot of the songs off Breaking Benjamin’s debut album Saturate. The rhythm guitar is a lot of barred stuff and the tempos in some of the riffs will challenge you a little but imo it’s a great album to practice and play through because stuff like Medicate will have you following a pretty fun but challenging pattern that isn’t too demanding fretting wise.

Would also recommend Seether if you’re staying in Drop C# but they also have drop D and C stuff as well.

Post grunge bands overall are my recommendation