Unless someone you know has a problem with sulfites, kill the yeast with campden tables, add another can of apple concentrate, then bottle.
Cider will mellow, if you can wait 6 months or so.
My friend Tom likes to load up his cider with sugar, so, it hits 10-11% ABV. Rather harsh.
Remember one unassailable statistic, as explained by the late, great George Carlin: "Just think of how stupid the average person is, and then realize half of them are even stupider!"
"I would like to die on Mars, just not on impact." Elon Musk