Here is an example on how to change the load more settings for any Total WPBakery module with load more functionality. Simply change "vcex_testimonials_grid" to the module you are using (ask if you aren't sure the correct name - it's the shortcode name).
// Change load more button for the testimonials grid module
add_filter( 'vcex_get_loadmore_button_settings', function( $settings, $base, $atts ) {
if ( 'vcex_testimonials_grid' == $base ) {
$settings['text'] = esc_html__( 'Custom Load More', 'total-theme-core' );
$settings['loading_text'] = esc_html__( 'Custom Loading...', 'total-theme-core' );
$settings['failed_text'] = esc_html__( 'Custom Failed to load posts.', 'total-theme-core' );
}
return $settings;
}, 10, 3 );