Congratulations, you made it to Blue Belt!
Now what!
At blue belt, you need to change your strategy to improving your game. As a white belt, getting better usually entails learning new moves. At first training Jiu Jitsu is like trying to play chess without understanding how the pieces move. Playing the game better means learning the about the movement of more pieces. At blue belt, you don't know everything, but you know the major positional goals and techniques. At this point, getting better doesn't mean learning new moves. You will certainly learn new tricks, but the key to getting better is how well you can string techniques together in a way that controls a match and leads toward a submission. This string of techniques is a "game".
A game? Tell me more!
So, what does a strong game look like? As you continue to get better this question gets more complicated. Getting comfortable with your first series is an important step to understanding what this looks like. When looking to develop your game, your game should:
Include 2-3 primary attacks that work well together. Techniques can work well together in different ways. For example, they can be one strong threat, and a strong follow up. A hip bump sweep to triangle choke is a good example of this. With these techniques, the defense to set up one, leads to technique two. Another example would be techniques that have similar positions, so you can launch into either technique at any given time. A good example of this would be a scissor sweep and a triangle.
Have 2-3 other attacks that aren't your primary threats, but you can mix into your threats. As an example, your go to is hip bump to triangle, but you have a strong guillotine and kimura response as well.
Have defensive responses. If someone is shutting down your offense, you should be able to successfully regain control and work back into your series.
Have multiple entries. You should be able to enter into your game from several different positions. If you are in bottom side, do you know how to enter back into your game? If you are passing half guard, do you know how to enter into your game? You need a pathway to reach your series.
How to build a game
Building a game takes discipline. You have to be focused in each roll on practicing your series. Show up to the gym with a plan. Ask to start in specific situations if necessary.
At first, your game won't be successful. You have to keep working on it until you can consistently get your self into position and start executing. Once you have gotten comfortable with 2-3 primary technique set ups, then its time to start problem solving it. Your game must be robust.
You should continue to focus on a series until you can successfully execute it on lower ranks, and occasionally on your own. It doesn't have to be flawless to move on, it just needs to feel comfortable.
Then What?
Do it again. Blue belt is about constantly starting over. You build a game, then build another, and another. By the time you get to purple belt you should have a at least one strong game from every position, and others you are at least familiar with. Starting over takes discipline. You have to allow yourself to feel vulnerable after learning to feel confident.