how to recover my true tone

If you have had the screen replaced and the screen is not original, then this may be the reason why True Tone does not work.

In some cases, it may also have something to do with an Accessibility function being activated. Check here:

Settings → Accessibility → Display & Text Size.

If you have one or more features enabled, try disabling and see if True Tone can be enabled again here:

Settings → Display & Brightness → True Tone