What can I do with a Samsung phone to increase privacy ?

Bought a Samsung on sale as its not exactly a chinese phone...
Only to notice it automatically installs Tiktok, Facebook (=Data-greedy) and other apps during first setup, also it says "Samsung Secured by Knox" during startup.


I care about privacy and want my phone to be mine, and not with a background communication that only someone else can control.
Please suggest the best solutions u can come up (even alternate OS) otherwise I might send it back.

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