Hey,
By looking the surrounding buildings, I assume you live in something similar, without balcony. As Leatherback told to you (just much more gently), it’ll die like this. You need to replicate outside conditions. You can make it, but it won’t be a cheap ride, and you need some knowledge. Easier to change it for an indoor plant, but if you absolutely want to keep (and alive), look up for building something with grow & full spectrum lights, ventilators, humidificator . (Here, where you need some knowledge to controlling that system for the needs of that specific tree).