In my house, I have a room upstairs in which I frequently do videocalls. The problem is that when I talk my family can hear everything downstairs, which is very annoying for them. So I would like to try to make it so my voice isn't hearable outside the room. This room has a wooden floor, through which I think the sound goes through the most, so maybe carpets? It also has wooden door. What measures can I take to improve the situation with minimal budget?
EDIT: I wouldn't like to build a structure around me, but to improve the room I'm already in