At the moment it's better to continue to hold good altcoins and on, in any case, do not rush with their sale. After all, now the cost of sales is low, but it will necessarily start to grow as the market recovers.
Yes, holding the cryptocurrency now is the best choice but why not get some more good tokens when they are very cheap. As for me, I invest in Cardano, Ethereum, NEO, TRON, Credits, OmiseGO, and Qtum.