If you’re a guitar player who’s interested in mastering blues lead guitar, then you’ve simply got to add a wide variety of blues licks to your repertoire. All the best guitar players have long improved their soloing abilities by copying and memorizing licks from other guitar players. From Stevie Ray Vaughan to Eric Clapton, all guitar players have borrowed licks from guitarists and other instrumentalists.
Traditionally, guitar players learn licks by copying and transcribing solos and lead lines. Transcribing blues solos can take a lot of time, but it’s a great way to really dissect another guitar player’s style. Once you’ve transcribed a solo or even individual licks, they tend to stay in your repertoire a while. Transcribing licks and solos is also great ear training.
One of the best books I’ve seen a while for helping people learn and memorize quality licks is “100 Killer Licks & Chops for Blues Guitar.” The licks are identified with a certain player, and there are licks from a wide variety of blues genres (e.g. Delta Blues, Blues Rock, etc).