Currently the most I hold is Bitcoin and a little OMG and ETH but trader wise, is there a recommended percentage?
My current holdings are:
BTC 60.75%
OMG 33.74%
ETH 5.51%
it's good percentage in my opinion.
60.75%% for Bitcoin is very precise because Bitcoin is the strongest Cryptocurrency and the price has increased steadily in recent years.
But I do not agree with 33.74% OMG I think it's too big also 5.51% ETH. The second strongest Cryptocurrency after BTC is ETH, so it is very useless if you hold only a little ETH.
But all the decisions are up to you.