Don't put all your money in Ethereum and Waves. I hold Bitcoin, Ethereum and Waves too but there's always a balance between them. I would never go over %50 for any altcoin. Sometimes Bitcoin could go over %50 but I wouldn't trust other coins as much as Bitcoin. Buy more for everything when you have fiat money though.
3 coins is also not enough. You can buy also more. For example wings, verge, monero.