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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…
Roles in authentik are for permissions in authentik. You want a group instead. Group memberships are send via OIDC.