Security component gold - when to put it in?

Hi dear financiers, I started financing in 2023 and am saving a relatively classic world ETF (ACWI IMI) as well as three other individual stocks as a core satellite portfolio. ​ The portfolio now amounts to around 35k with an internal rate of return of 20%, so everything is great on the front. Unfortunately, since I don't earn that much and sooner or later stocks will experience a setback, I would feel more comfortable adding a security component. REITs or