SR Guitarists, Hitting a plateau.

I've been playing since I was 9 (trust me, a looooooong time). I know exactly where you're coming from.

All of the above selections are quite good. I'll add a couple more that have helped me through the years:

1) Find some new people to play with. Find a jam session (such as Phil Brady's Blues Jam in BR if that's where you are - but every city has one) and get in on it. In a lot of places, there will be places you can go to camp out for a weekend and just play (I'm in N. Texas now and there's one of these several times a year - of course, those campouts are typically just for acoustic, but that's cool too).

2) Take some private lessons! Mentioned, but worth mentioning again. Every teacher has a different approach. That's a great way to open up new ideas.

3) Get a method book from Amazon.com or something. Of course, I don't mean beginner's books. There are so many books of methods, etudes, exercises, by so many of the great guitarists. Any of them can be helpful. There are even some books that sort of cover the 'philosophy' of playing (such as the Fretboard Logic series).

4) Play on a different guitar/amp/pedal. Different tones can really motivate you to try new things. I own about 10 different guitars and a couple of amps. Every one of them demands a different kind of synergy from me. My archtop has such an open tone that it virtually demands I play fat jazz chords. My Les Paul motivates me to just turn it up and let it scream. Amps are slightly different. I use a modeler through a solid state Fender amp in church. Sometimes, I'll switch it to a Bassman model and other times I'll use a Vox or a Marshall model. The different models are so tonally different that they make me want to play different ways (lately, I've really been enjoying maxing out the gain on a Vox model and using a nickel as a pick - get's very "Bryan May-ish". Then, of course, there are pedals. Those are like an instrument to themselves. You really want some inspiration - go get a new pedal (like maybe a Digitech Whammy or a nice delay/echo pedal - even a looper). Those can really inspire as well.

Good luck. You'll break out of it.