My flashlight and camera are not working. I can only take selfies.

Follow the steps in the Related Article above your post. If that does not fix it, the final step is to contact Apple Support.

Contact Apple Support

If the camera or flash still isn't working properly, contact Apple Support to discuss service options.

Soshelpsolotions ~ Does your iPhone 11 still have its original battery?

And what's the Maximum Capacity % here?...

Settings > Battery > Battery Health & Charging

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