As
Rolla and
tyrion said, you need to get a stem that is angled upward and/or some new bars that have a rise to them.... riser bars.
The thing coming out of the head tube of your bike is the steerer tube that is attached to the fork. They do make extenders for the steerer tube, but I wouldn't recommend them unless you are a very gentle rider and never yank on the bars as you power up a hill.
Not that I know they are problematic from any experience. Just that they don't seem right to me. Besides, you really need a bike that has a stack height that puts the bars where you want them without all the extra stuff. Aesthetically weirdly angled stems and bars way higher than the head tube just look atrocious to me.
But I'm okay if you don't care to satisfy my sense of aesthetics. I don't chuckle loud enough for any to hear me when they pass. <grin>