The 0.618 retracement level on the xmr/btc chart has proven itself as a support level. I think it might be a smart idea to open a long once it hits those levels again. As selling point i'd sell a portion of your position around the 0.236 retracement level since we've seen this as a resistance zone. (this is safe zone to sell). If you want to take a little more risk you could try and wait to see if you can sell around the 0.0 retracement level.