I lost all my inbox Mail a few days ago it’s not anywho have looked

See the article Filter emails in Mail on iPhone - Apple Support

Filter emails

1. Tap  in the bottom-left corner of a mailbox list.
2. Tap “Filtered by,” then select or turn on the criteria for emails you want to view.

To turn off all filters, tap . To turn off a specific filter, tap “Filtered by,” then deselect it.