-Locate a bubble with three unexplored bubbles next to it. The explored one will be the one you used to get to your current bubble. The bubble should have some pretty strong enemies. Let them kill you. You will be taken to a bubble next to the one you died in. If you are at a high enough level, it will be full of life carriers, bubble balls, and various small enemies. Kill them all, then go to the other two bubbles next to the one you died in. Kill everything in those two. If done correctly, you should have many more bubbles than you started with.
-Go in spirals around your home bubble. This way you can defeat the enemies easily after they begin attacking.