Dracaena Marginata needs some help!

We have an office Dracaena Marginata plant that was not doing too well recently. However, we repotted him, and put him in an undisturbed place where he can get a lot of sunlight, and basically have been watering super super infrequently because of it's dessert-likeness. However, the existing leaves still seem to be pretty grumpy and limp. Any suggestions or help? Is it dead, or is it salvageable? Should we fertilize?