I guess I can relate on a certain level.
It's the mixing learning curve, the majority of the progress is made I'd say in the first 6 months to a year depending on the person, and after that it's just fine tuning here and there, experimenting with different things.
I wouldn't go as far as to say that you don't 'get better', you always get better just not in bigger steps you did earlier on.
That's also a personal thing, some people like me for example never feel good enough, there's always something to improve, some people peak.
My advice is keep working hard at it, and do what you want to do; maybe you've just gotten bored with mixing.

ya i know what you mean
i think i'm there as well
it seems like you just don't get any better even though you practise everyday and such.

You kind of answered your own question, there. If you've come to a point where your mixes are clean and all, then I'd say yes, start concentrating on "what" you're mixing as opposed to "how" you're mixing. It's real easy to get comfortable with always doing the same mix you already know works well.There are some songs that work so well together that it's almost difficult to try anything else. Don't get me wrong, though. If you've got a mix that is really hot and it's something that you don't hear the other DJs doing, there's nothing wrong with using that same mix most of the time. That sort of becomes your "signiture". Of course, I'm only talking about a certain mix of two songs...not a whole two or three hour set. If you find yourself doing the same set again and again...then you become boring.But as far as two songs, if it's a really hot mix and you play to a regular crowd, they expect to hear it. And just when they think that they know what is coming, then you can start teasing your crowd by doing things like... finding points where you can overlay the two....but just for a few moments and don't bring the second song up to full volume but just enough that they can hear it riding with the first song. Then instead of going all the way into the second song, mix into something totally different (make sure it's just as kick ass as the other one, though). When done right, it can send a crowd into a frenzy. And now, I'm just rambling and have totally gotten away from your question, huh? So, back to your question....yeah, if you've got your mixing down...then concentrate on your content.

ok, thanks, hmm, concentrate on what rather then how now...
makes sense, i guess i sorta knew that just i dunno.....

oh, and anscoop. i definetely have NOT gotten bored of mixing!! its the best!! =)