1) I earn money. But I've been seeing my lucky numbers a lot today. I think it's a sign.
我在赚钱
2) make a profit
在...上赚钱
3) I specialize in money.
我的专长是赚钱。
5) make a profit on
在……上赚钱，在……上获利
6) make money
赚钱，挣钱
参考词条