No offence to Bitcoin but I don't keep any portion of my net worth in cryptocurrencies. It is very risky plus I also don't by sleepless nights due to excessive movements in the prices. I only keep small amount of money in Bitcoin, around $80-100 to pay for any instant expense in Bitcoins.
I think 5%-10% is the percentage of net worth you can invest in cryptocurrency, although you can invest in any percentage you want. However, if you decide to invest more than 50% of net worth, you need to know the risk, so if something happens with your investment, you can find a solution to solve it. I don't have a fixed amount to invest in cryptocurrency because if I want to buy more bitcoin, I only use the money that I got from 2017-2018 so I don't use my savings in the bank to buy bitcoin.
Percentage varies depending on case-to-case. Younger individuals are more tend to take risks then the aged individuals having families. So young individuals can invest more percentage of their net worth in cryptocurrencies than latter.