You can do this, if on the Seller Hub, click on the little box left of the item scroll up to the tab Actions.
From there select End Item, selecting the reason... End to Highest Bidder.
However, personally I would not do this, you have quite a few days left to run, and you may, no guarantee of course, receive more bids and the item will reach a higher price for you. I would let it run, but the choice, of course, is yours.
@nigel0903