I think bitcoin is the king, so holding altcoins (even ethereum) is high-risk method right now, if bitcoin hits 25-30K many altcoins will drop 100% at latest, so trading is the safest way for me!
in your opinion what is the safest way to gain 1% daily profit from trading?
Holding bitcoins alone would be another risk. So, it's better to diversify your investment on coins that you hold, at least 25% Of it. Ethereum, Monero and Litecoin have proved themselves to be a good buffer.