Openings

#1
"I sometimes feel a little bored with them" ++ how can you feel bored? What then should a professional player say who plays and analyses the same openings in hundreds of games? Kasparov for example has played Sicilian Defence as black in 530 classical games.
"feel reluctant to change, given they seem to work for me." ++ Do not change what works.
"Do you think I’m limiting myself?" ++ No, not at all
"an alternative, more attacking opening for black." ++ Sicilian Dragon is the sharpest you can get.
"Any suggestions?" ++ You did not mention any defence for black against 1 d4. Sharpest are the King's Indian Defence, the Grünfeld, the Benoni, the Benkö Gambit etc.