How to restore iPhone 5s?

Restore your data or reset the phone?

Do a backup and try a factory reset. Then restore from your backup.

Restore to Factory setting. https://support.apple.com/en-us/HT201252

Backup - Restore your device from an iCloud or iTunes backup. https://support.apple.com/en-us/HT204184

See Restore your iPhone, iPad, or iPod touch from a backup https://support.apple.com/en-us/HT204184