Just so you know, doing classical music can seem boring, but it really does improve your technique.
That said, try some new, more challenging stuff. Rise Against has a very similar style to everything. Try some other pop music, from a lead sheet.
Oh yeah, and before anything else, you can't really expect help on here if you can't read music.... Just saying
Feel free to ignore this... But if you learn scales, arpeggios, how to glissando, playing in key signatures, chords, 7 chords (particularly useful in pop), and most of all READING MUSIC

It'll give you a huge hand (pun intended). Learning new technique is as simple as playing shite tons of music and seeing what different artists do. I'm not a huge fan of the pop music scene (a certain comedian I love says why, look up Bo Burnham repeat stuff), but look up some well known songs, you can get people to sing very easily
