immagine del profilo
Why do you want to diversify further?
Have you looked at how many companies are in the ETFs you already hold? An all world is virtually unnecessary. If anything, an emerging markets could still be included.

You can do gold. But gold is not necessarily an investment that you can sell after just one year. Of course you can, but it's not ideal for that.
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immagine del profilo
@DividendenWaschbaer The idea of buying gold is more or less just a side idea (if the price falls, it is already rather high at the moment) to take some tax-free profit.