Congrats- you are at my favorite point of jiu jitsu rank progression (based on my experience so far as a brown belt).
At blue (especially early blue) my goal was to just learn and get exposed to as many new positions and techniques as possible. Dive in to DLR, X guard, 50/50, SLX, Spider, Lasso, deep half guard, etc. Collect techniques, positional concepts, just expand expand expand your knowledge of BJJ.
Later in blue belt- as you approach purple, you can start to refine and consolidate and really develop your "core game". But for now, you need to experiment as much as possible to see what you like and what works best for your body style and personality.
Please know- all this experimentation is going to make you feel like you suck. You are probably decent at a few things now, and can hold your own with blue's, and beat most of the whites. Once you start trying new shit- it isn't going to work well right away. You won't get the DLR sweeps and your guard will get passed. Your spider will suck and you'll tap to people you never would have if you played your "A" game. THIS IS OK. Don't worry about "defending your belt" worry about building the next ones. Even now, I'm really working on RDLR. There are some blue belts who would never pass basically any other guard I would play who are passing it. As long as I stick with it, 6 months from now, they won't. Play the long game.