can't uninstall

What was the error when you tried to remove the field?

I get this message when I delete the field. The field is well deleted.

Drupal\Component\Plugin\Exception\PluginNotFoundException: The "paragraph" entity type does not exist. in Drupal\Core\Entity\EntityTypeManager->getDefinition() (line 139 of core\lib\Drupal\Core\Entity\EntityTypeManager.php).

Drupal\entity_reference_revisions\Plugin\Field\FieldType\EntityReferenceRevisionsItem::schema(Object) (Line: 480)
Drupal\field\Entity\FieldStorageConfig->getSchema() (Line: 517)
Drupal\field\Entity\FieldStorageConfig->getColumns() (Line: 1655)
Drupal\Core\Entity\Sql\SqlContentEntityStorage->readFieldItemsToPurge(Object, 10) (Line: 557)
Drupal\Core\Entity\ContentEntityStorageBase->purgeFieldData(Object, 10) (Line: 83)
field_purge_batch(10) (Line: 143)
Drupal\field_ui\Form\FieldConfigDeleteForm->submitForm(Array, Object)
call_user_func_array(Array, Array) (Line: 129)
Drupal\Core\Form\FormSubmitter->executeSubmitHandlers(Array, Object) (Line: 67)
Drupal\Core\Form\FormSubmitter->doSubmitForm(Array, Object) (Line: 597)
Drupal\Core\Form\FormBuilder->processForm('field_config_delete_form', Array, Object) (Line: 325)
Drupal\Core\Form\FormBuilder->buildForm(Object, Object) (Line: 73)
Drupal\Core\Controller\FormController->getContentResult(Object, Object)
call_user_func_array(Array, Array) (Line: 123)
Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() (Line: 627)
Drupal\Core\Render\Renderer->executeInRenderContext(Object, Object) (Line: 121)
Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->wrapControllerExecutionInRenderContext(Array, Array) (Line: 97)
Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() (Line: 181)
Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object, 1) (Line: 76)
Symfony\Component\HttpKernel\HttpKernel->handle(Object, 1, 1) (Line: 58)
Drupal\Core\StackMiddleware\Session->handle(Object, 1, 1) (Line: 48)
Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object, 1, 1) (Line: 28)
Drupal\Core\StackMiddleware\ContentLength->handle(Object, 1, 1) (Line: 32)
Drupal\big_pipe\StackMiddleware\ContentLength->handle(Object, 1, 1) (Line: 106)
Drupal\page_cache\StackMiddleware\PageCache->pass(Object, 1, 1) (Line: 85)
Drupal\page_cache\StackMiddleware\PageCache->handle(Object, 1, 1) (Line: 48)
Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object, 1, 1) (Line: 51)
Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object, 1, 1) (Line: 36)
Drupal\Core\StackMiddleware\AjaxPageState->handle(Object, 1, 1) (Line: 51)
Drupal\Core\StackMiddleware\StackedHttpKernel->handle(Object, 1, 1) (Line: 704)
Drupal\Core\DrupalKernel->handle(Object) (Line: 19)

Finally I have the problem with other deletion fields.
Paragraphs seems to be responsible https://www.drupal.org/project/paragraphs/issues/3165612 🐛 The "paragraph" entity type does not exist error after uninstallation due to left key_value entries Active

After follow instructions on the link, I can uninstall clearly metatag.

Sorry for the inconvenience

No problem, I'm glad you were able to solve the problem.