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How to mitigate the risk of Euro Stoxx 50 ETF?
While you would reduce risk by diversifying into other stock ETFs across the world, Developed Market returns (and Emerging Markets to a lesser extent) are generally highly correlated with another (correlation of ~0.85-0.90). This implies that they all go up in bull-markets and go down together in bear markets. You are better off diversifying into other asset-classes given your risk tolerance (such as government bonds, as you have mentioned). Alternatively, you can target a portfolio owning all of the assets in the universe (assuming you're trading in Frankfurt, a combination of something similar to H4ZJ and XBAG, but with higher volumes and/or lower fees)! A good starting resource would be the Bogleheads Wiki: https://www.bogleheads.org/wiki/Asset_allocation