Hi, I picked up guitar again after a couple of years. First thing I understood was, I would have to work on my technique. I started with Chromatic Exercises, fretting the 1,2,3 and 4th fret on the 6th string while doing alternate picking. Then moving on to the 5th string fretting 1,2,3 and 4th fret all the way upto 1 string and moving one fret ahead on my way up. Thing is, I am able to do this to 165 BPM at eighth notes (two strokes of pick for one beat), but cant seem to go beyond it. Been stuck at this speed for past one week. I tried again and again, but had to stop cause I feel pain in my wrists. I get very little time to practice as I work (not music related job). Can someone suggest tips to increase speed?