H1 for homepage logo

Try adding this PHP Snippet:

add_filter( 'generate_site_title_output', function(){
    return sprintf(
        '<%1$s class="main-title"%4$s>
            <a href="%2$s" rel="home">
                %3$s
            </a>
        </%1$s>',
        ( is_front_page() ) ? 'h1' : 'p',
        esc_url( apply_filters( 'generate_site_title_href', home_url( '/' ) ) ),
        get_bloginfo( 'name' ),
        'microdata' === generate_get_schema_type() ? ' itemprop="headline"' : ''
    );
} );

Many thanks!

You're welcome!