To add, somethings I forgot.
Samsung Knox does not exist anymore. All of it was integrated in AOSP so any modern Android phone has these protections.
There isn’t really an alternative to Google Pixel or iPhone. If you chose not to get this for perhaps understandable reasons and limitations you will have to deal with the consequences of this. I can’t make it any brighter. You can always try to disable or uninstall as much bloatware but it will never get to a similar level.