Semrush says blog page doesn’t have h1

Hi there,

Blog Pages aren’t a standard page – to add a H1 you will need to use some PHP in the free theme:

add_action('generate_after_header', function(){
    if ( is_home() ) {
        echo '<h1>Your blog page Title</h1>';
    }
},20);

How to add PHP:

https://docs.generatepress.com/article/adding-php/