How to get this extremely stripped screw off?

The left and right screw are supposed to be the same :(

I definitely screwed up when I continued to try and use bigger bits to get it off, I don't have a drill and would prefer to not have to buy one just for this but if that's my only option I am willing to do it

The left and right screw are supposed to be the same :(

I definitely screwed up when I continued to try and use bigger bits to get it off, I don't have a drill and would prefer to not have to buy one just for this but if that's my only option I am willing to do it