When I play piano or keyboards, I've noticed that I keep slipping into playing the same chords (and variations thereof, such as very simple bass lines) with my left hand while I use my right hand to play some melodies. It doesn't sound wrong, but certainly not very professional.
I know that this is partly because I'm right-handed and therefore my left hand lacks some of the strength and dexterity that my right hand has, but somehow I'm also not very imaginative when it comes to accompanying the melodies I play with my right hand. Also, I am more of a keyboarder than a pianist, so maybe that's why I just tend to bang out chords. I've also noted that I'm okay at writing piano/keyboard parts for my right hand, but most of the time I'm really just unsure how to write (and play) a good left hand part.
Are there any specific techniques I could use to break out of this repetitive behavior? I'm not really sure what to do here.
Edit: Thanks for the comments so far. I do have some sheet music that I like, so I'll see if I can make some use of the left hand parts there. I mostly play rock and metal-ish things but I occasionally dabble in classical music and film scores. This sometimes makes things difficult because the different parts are often only transcribed to piano but were originally written for strings/guitar/whatever other instruments, or at least that's how it seems to me. I've checked out some jazz sheet music but it seems pretty daunting so far, I'll see what I can do.