add_action('accordions_tabs_main', 'accordions_tabs_main_18032020', 10);
function accordions_tabs_main_18032020(){
?>
<p>Custom content here </p>
<?php
} 
add_action('accordions_tabs_main', 'accordions_tabs_main_18032020', 10);
function accordions_tabs_main_18032020(){
?>
<p>Custom content here </p>
<?php
}