Hi !

try to make a practice plan for the whole week or so, and stick to it. Use chord changes and chromatic exercises as warm-up, then scales ( start with pentatonic and major "3 notes per string" scale in root position i.e root note under index finger). Arpeggios come next. pick two shapes ( 1 major, 1 minor ) and play them over and over for the whole week. Use whatever technique you want to work on primarily ( alternate picking, sweeping, economy...) . Also ALWAYS use a metronome for everything and learn how to subdivide the beat and be very accurate about that. Then learn some theory and harmony, and work on a written piece... All of that should keep you pretty busy but really help you break through that plateau. Also stay relaxed through all the process. If any point you tense up, not good. You might want to consider taking some lessons with an excellent teacher in your area. Select the teacher carefully.

Hope that helps. :)