ouch a sad story, buy 2 btc at 18k, now at 8.5k you've lose half of your total capital.
Hard decision is indeed between cutloss or remain patient waiting for the right moment to sell it. You only have one hope, which is to wait for the miracle of halving BTC next year, whether it will be the same as the expectation or far from the expectation. just hope it will be better.