Use a VPN with Passepartout
Passepartout is a free, open-source, and user friendly OpenVPN app with presets for multiple providers (including Mullvad and ProtonVPN, two recommended VPN providers) and easy configurability.
Block content in Safari with AdGuard for iOS
AdGuard for iOS is a free (and open-source) content-blocking app that allows you to set filters within Safari. As required by iOS, it uses the native Content Blocker API for even greater privacy.