the 1st variant - hold opened long positions and wait when money from Bitcoin moves back to altcoins. It will give new buy opportunities on good levels. We should wait for altcoins' trend reversals when Bitcoin starts falling.
the 2nd variant - just close the part of trade on altcoins and get free money for buying altcoins on lower levels based on confirmed reversal signals.
the 3d variant - move the main part of altcoins to Bitcoin and hold in long term. Bitcoin is the main financial instrument for investing. Big investors and financial companies buy Bitcoin , it means in long run we'll keep market. All correction movements on this market will give good trading opportunities for adding new to long positions. It will be logical to hold Bitcoin with targets at 10 000, 15 000, 20 000 levels.
These 3 variants are my thoughts based on the current situation. I don't offer to follow these variants. I offer to take them into consideration, but you have to act based on your ideas and trading strategies. Only you responsibale for your financial decisions.
And what about your ideas for managing opened trades now? Please, write in comments.