I was thinking maybe 50% bitcoin, and 5-10% in many other cryptocurrencies like XRP, Ethereum, Stellar, Cardano, etc.
good plan, diversify to minimize risk is never wrong 
how about 50% BTC, 25% ETH, 25% BNB but I strongly recommend you to do your own research before buying them
you may want to check the top 10 or 20 coins on coinmarketcap to choose from
welcome to the forum, happy investing and may luck always be on your side
