I think it is a Sageretia.
He gets 3 times a week water with supplements, he stands 5 meters of the window.
Well, it looks pretty dry.
As a matter of fact, it looks almost dead.
Watering 3 times a week is not enough, supplements are not necessary all the time, 5 meters from the window is too far from the light, it needs wind.
And water.
And sun.
One thing you could do is take it outside; where do you live?
If it is not already freezing cold, of course.