Variegated serissa being finicky and browning/dropping leaves
First of all, I know that serissas are notoriously difficult and hated throughout the bonsai growing community. However, some plantseller conned me into buying one with promises of super-easy maintenance and copious flowers. However, it has started to grow, brown, and drop leaves continuously ever since I purchased it from him, when it had previously been flourishing. I've put it outside after having it indoors, watered it copiously, and left it in the sun. As you can see, there is new growth, so it's not totally dead... but how can I keep it green? What on Earth does this plant want from me?