Identify your strengths. If you choose to be the fastest guitarist on the planet, be prepared for the massive dedication that goal will require. You may find that incredible playing speed isn't necessary to reach your objective.
This article explains that a solid process occurs over time through incremental change. Be patient, small daily improvements add up to huge improvements. These principles apply to all projects - from mastering a difficult guitar technique to making blueberry pancakes. Yes, I really said that.