whatever you choose to work on, start (very) slowly, and use a damn metronome :)
you want to get as clean and precise as possible, and really aim for the best sound you can have at low speed.
Work that way on whatever material you want to learn (i did the major scales, all over the neck, with a modulation (c- f-Bb-Eb-Ab-Db-...) every time finished one position for example) this for a few hours, and you'll notice your technique increase