How can enable a disabled iPhone 6 Plus s when remember passcode without erasing its data?

Once it is disabled your only option is to reset it. See this Apple support article—>If you forgot the passcode for your iPhone, iPad, or iPod touch, or your device is disabled - Apple Support

After completing the restore from Recovery Mode you can restore your most recent backup.

You need to restore it. However, since you know the passcode you can restore to a prior backup.

If you forgot the passcode for your iPhone, iPad, or iPod touch, or your device is disabled - Apple Support

Restore your iPhone, iPad, or iPod touch from a backup - Apple Support

-AJ