run a drupal hook only once

module.php

<?php

/**
 * Implements hook_form_alter().
 */
function search_form_views_exposed_form_alter(&$form, FormStateInterface $form_state, $form_id) {
  $requestStack = \Drupal::service('request_stack');

  // Get the current request object.
  $request = $requestStack->getCurrentRequest();

  // Retrieve the alter count from the request attributes or initialize it to 0.
  $alterCount = $request->attributes->get('search_alter_count', 0);

  // Increment the alter count for each load of the alter hook.
  $alterCount++;
  $request->attributes->set('search_alter_count', $alterCount);

  // Execute the code only on the second load of the alter hook.
  if ($alterCount === 2) {

    if ($form["#id"] == 'views-exposed-form-search-page-1') {

       // my alter code here...
    }
  }
}