I'm getting the s24 ultra , what are the best things I can do to make it more secure

I know I should have gone with a pixel and caylx os but I really like dex and the now 7 years of updates . I'm concerned more about security than I am privacy but I don't wanna just hand myself over to samsung trackers .

So what are the things I can do to make my phone as secure and private as possible .

can dex don pixel privacy security things ultra updates