You want to switch to the solar energy industry, which is not contradictory to your major. You can do sales, personnel, administration and translation in such enterprises. But I think you'd better stick to international trade in your present situation. Although the financial crisis has dealt a serious blow to international trade, you should look at this industry from a long-term perspective. In 2007, China's total foreign trade reached its peak, but after several years, maybe two or three years of adjustment, international trade will reach a new height. After a reshuffle of international trade talents, old people will change careers and new people will take on heavy responsibilities. Then here's your chance. Plus your foreign language is very good, it will be useful. Please think it over.
If you think what I said can be used for reference, that's best. If you have decided to change careers, you must take the relevant certificates. I wish you success!