If you have forgotten your Screen Time passcode
Use this link to reset your passcode If you forgot your Screen Time passcode - Apple Support
If you are unable to reset Screen Time passcode from the above link then, you will need a computer. If you don't have one, borrow from a friend.
Forgot? Click below to reset…
Click->If you forgot the passcode for your iPhone, iPad, or iPod touch, or your ...
Regarding your data, If…
- You have an iCloud or iTunes backup, I am sorry there is no use of a backup because if you restore from your backup your Screen Time Passcode will be back.
- You have synced your data to iCloud, then what you will get back is what you have synced to iCloud and uploaded to iCloud Drive; like the information that are synced and stored in iCloud are, Contacts, Calendars, Bookmarks, Mail, Notes, Voice Memos, shared photos, iCloud Photos*, Health data, call history, and files you store in iCloud Drive. (*-If you had turned on iCloud Photos, your content is automatically stored in iCloud.)
- You have imported your Photos & Videos to Mac/PC then they are safely residing there
- You have uploaded some of it Cloud Drives using Files app (iCloud Drive, Google Drive, OneDrive, DropBox, Flickr, box, AmazonDrive, Adobe Creative Cloud etc)
- You have not imported nor you have synced nor uploaded your data to cloud drives prior to forgetting the Screen Time passcode then I am sorry, all your data is lost.