Good analysis and you are right, diversification is key in investing. For some asset classes it might sense though to diversify even more. If you don't know anything about stocks, it might make sense to still put 20% in through an index fund.
Also, remember the risks and storage costs of your assets. Back-up your passwords and private keys for cryptos safely. Make sure that the gold you own isn't worth less than the security measures you have to take for it not to be stolen.