Need advice for building cryptocurrency portfolio

[Arwinkim]

Hey, guys. I need your advice to build a strategic good portfolio better %ROI than bank deposits. So, my plan is as follows:

BITCOIN 50%

TOP 5 COIN (Coinmarketcap) 25%
ICO 25%

I decided to give more portion for Bitcoin because it's the mother of all coins. My capital is really big though that's why I want to diversify it into several profitable coins. The only problem here, I have to be careful when I invest it in ICO. You know most of 'em are SCAM.