been playing now about 4 months i think, and my playing is ok i suppose for the time ive been doing it, but im stuck now i dont know how to move forward what i should be learning next, i cant seem to get past playing like this (ignore the mistakes, im not perfect)

http://www.youtube.com/watch?v=Bzscz6dA21E

what should i do next, work on my speed or better phrasing or what (all i do is improv over backing tracks... any constructive advice welcome..

thanks ;-)