Yo, I'm stuck at some sort of musical block in my jazz playing, namely improvising. I just about a year ago got out of my blues/rock phase to explore more challenging material. My sight reading is fine, and my understanding of the theory is superb, but my improvising is trash. I'm stuck using the major and minor pentatonic, and although I know which scales or modes would fit any particular progression, anything I play besides the pentatonic sounds linear and predictable. I think some of what I'm looking for is to be able to nail the chord changes, but what does it mean exactly to nail a chord change? In terms of arpeggios, I'm hardly able to throw out the correct arpeggios as fast as the chords change. However when I do pull this off, its sounds very predictable because I've never figured out how to link the arpeggios together for a smooth transition.
I have lots of time on my hands and I practice at monstrous amounts everyday but I don't think I'm using my practice time to its full potential because I don't know really what I should be focusing on to improve my Jazz improvisation. If you have any tips or recommendations on how to improve my improvisation, if you could push me in the right direction it would be awsome.