Government bonds in foreign currencies. Of course this exposes you to whatever that country does with their central bank and to foreign exchange rates.
Corporate bonds, obviously riskier than government bonds but at least you can get positive interest rates in your preferred currency
Preferred stock, which are similar to bonds. Before you invest in these, make sure you know how they work. They can be called back by the issuer
Other asset classes which are less safe but could help you diversify: crypto, commodities and precious metals, collector's items and art, foreign currencies. Wouldn't really recommend putting too much money in this