Life JN can make money. That depends on whether LZ has learned it. 68J doesn't recommend playing T and darts. Unless you are bored, you can help people and kill magic weapons through the plot, provided that you are strong enough. Opening a shop may be a good choice. BB shop makes a lot of money, but it's a little tired. If you want to earn more, you should keep catching it. This is the conventional method, others are selling things, earning the difference, catching ghosts, sealing demons, practicing BB to drop rings, digging maps and so on.