Is there a reason you didn’t mount it to the ceiling? That way the force would stay mostly vertical.

The way you have it, the force to raise it changes from mostly vertical to nearly horizontal. That horizontal force is going to be huge because it’s mostly just pulling instead of working against gravity.

Think of trying to raise a weight in the middle of a rope by stretching it out horizontally instead of just lifting it straight up.

You could also just mount a pulley on the ceiling.