Opt out of personalised advertising, reset your advertising ID frequently, use websites were possible in place of apps and any apps you do have review permissions regularly, go through your apps and turn off “learn from this app”, enable location services icon to see when apps are using your location, either use extensions to enhance your browsing experience that block ads and tracking or use a private browser such as Firefox (I don’t suggest using brave but others may vouch for it), set up a VPN for cases where you may need to use someone’s else network (protonVPN has a free tier but also offers premium options, rename your device to something generic such as “Bluetooth device”, by default your iPhone will probably be called YOURNAME’s iPhone as silly as this one sounds it’s worth changing as you aren’t advertising your first name over Bluetooth.
Hope this helps.
While it is the same at the core (both using webkit) I still recommend FF over safari. FF is better at blocking tracking all around and has better privacy features such as force https.