Room separation ideas?

So I share a bedroom with our upstairs “living room”. I live with my grandparents, sister and dad. My grandparents and sister have a bedroom downstairs. My dad has a bedroom upstairs. The upstairs is basically a 2 room area. There is an open space that we use for a living room for just me, my sister and my dad when we don’t want to be downstairs. However, I also share that room as my bedroom since we don’t have enough rooms. I did have command hooks on the ceiling with long curtains hanging down from the ceiling to make a makeshift wall so I have some privacy and feel like I have a room. But the command hooks didn’t stay up (after 2 months they fell). What is an idea that I could do for a make shift wall? Is there a “stickier” thing like a command hook I could use? Or does anyone have a better idea? I tried looking into an actual room separator but they are too expensive for me.

Thanks in advance!