If your portfolio contains such top cryptocurrencies like bitcoin, ethereum, binance coin or other top cryptocurrencies, then you can either re-invest in the same top cryptocurrencies or just wait till that moment when these top cryptocurrencies will start to grow again, because top cryptocurrencies are constantly either growing in price or fall in price, but about new altcoins, everything is already complicated here, because most new altcoins die after some time and therefore it is better to try not to invest in new altcoins, thats why I more invest in top cryptocurrencies than in new alctoins.