This is a little my experience of our way to diversify the Crypto investment portfolio, hopefully useful.
20% to 40% in Top 10 Coins
Invest about a quarter of your funds in top coins such as Bitcoin, Ethereum, XRP, Litecoin, etc. These they are market drive currencies whose prices often change rapidly and largely. So, limit your investment in this coin to no more than 30%. You can check the coin in coinmarketcap.
20-30% in popular Altcoin
Altcoin is a currency made as an alternative to Bitcoin. Some are popular including neo, xlm (stellar lumens), binance coin (BNB), etc. Experts strongly believe that Altcoin is most likely to outperform Bitcoin and other established coins.
This is because they have a strong foundation along with great growth potential, such as earnings structures, utility mechanisms, etc.
There are many other similar altcoins that have great potential. Risks with these coins are arguably a minimum while the potential return remains high in the long run. So, most of your investments are better on assets like this.