The best alternatives to CopperheadOS are JUMBO, Ghostery, and GrapheneOS. If these 3 options don't work for you, we've listed a few more alternatives below.
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Ever wanted to delete old tweets or old Facebook posts? Stop location tracking or simply secure your personal data?
Jumbo gives you back control over your data by scanning the apps and services you use, and provides actionable recommendations to increase your online privacy and security. You decide what recommendations to act on and Jumbo will take care of the rest.
GrapheneOS is an Android-based, security-hardened, privacy focused, free and open-source, mobile operating system for selected smartphones. It was known as Android Hardening until March 2019, and is focused on privacy and security. It is compatible with several Google Pixel smartphones.