We do not the percent of your losses. If you have more than 80% - so just hold. You loss a lot and to fix this losses is not very correct. You can wait at least little market rising, and only than sell with small losses. But if you only have -20% now - so sell and do not think. Market will go a little deeper soon and you can buy more alts to your portfolio. But the best way in crypto now - not to buy alts and hold Bitcoin)
if you do not buy altcoin, and store Bitcoin, then first of all you should have confidence that Bitcoin will bring you profit in the future. preactum must be cold-blooded to all fluctuations in prices in the crypto-currency market, because a bad market condition can lead to a heart attack.