If you want to trade, you need a Type-7 next. If I were you I would strip the viper of any parts worth anything, trade in the T-6 and invest in a a T-7. I wouldn't buy it however unless you have about 27 mil net worth though (you can see your net worh under statistics, it includes the price of you ship) you need to have A class thrusters, A class shields and a Shield Cell Bank, and preferably an A class Power Distributor, plus the money to pay insurance AND money to fill your cargo hold. I was making at leat 3 million/hour with my T-7, try trading in Supercoductors if you can find them cheap <6200 cr (Refinery systems that AREN'T also high tech).
Fairly positive you don't need most of those things to trade effectively in a T7. An A-rated shield generator with some shield boosters and a B or A rating FSD will do you nicely, along with 216 tonnes of cargo space.