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GrapheneOS provides users with the ability to set a duress PIN/Password that will irreversibly wipe the device (along with any installed eSIMs) once entered anywhere where the device credentials are requested (on the lockscreen, along with any such prompt in the OS).
Check out EFF cover your tracks: https://coveryourtracks.eff.org/
The results are very interesting. For me, the most unique thing about my browser was that I had two system languages, and so the accept-language header was very unique.
I now use vanadium (graphene OS), which simply sends made up values for a lot of headers, and so makes fingerprinting harder.
In general, you should try to be as “normal” as possible, use standard settings for everything, just accept English, etc…