Ah, bonsai trees- a fickle, but gorgeous plant. Keeping a bonsai alive for a long period of time is certainly a feat to accomplish, but is awfully rewarding and certainly worth the time and patience! Bonsais should be kept in bright, direct light- as much as possible, just like a real tree. They also enjoy high humidity, which can be accomplished by misting the plant, or placing a dish with damp stones beside it. Don’t water the bonsai with a routine. Rather, check the soil, and water when the first top centimetre of soil is slightly dry.
With enough time and patience, surely your bonsai will thrive!