but on google page you see that the css for it is:

font-family: 'Archivo', sans-serif;
font-family: 'Archivo Black', sans-serif;

so test both

i uploaded the variable font and there it is only “archivo”

Was ich aber auf deiner Startseite sehe ist doch ein ALB: Submenü – oder?
Wo wäre da das Menü inclusive der Mega-Menü Setzung?
Die Option Mega-Menu gibt es bei Sub-Menü nicht.

see result here – ( it is up to you how to place path inside that svg )
https://clean.webers-testseite.de/eichenhaus/

it just uses the header-scrolled class to change the logo inside:

#top #header  #Bild-Logo,
#top #header  #Text-Logo {
  transition: all 1s ease;
}
#top #header.header-scrolled #Bild-Logo {
  fill-opacity: 0;
}
#top #header.header-scrolled #Text-Logo {
  fill-opacity: 1 !important
}

and with the same logo – on transparency change fill option:

#top #header:not(.header-scrolled).av_header_transparency  #Eichenhaus-Logo .eh0 {
  fill: #fff
}

see Startpage of the link above

on your initial page there is a svg Logo on top right. ( The “S” from Schreinerei is not well verctorized – if you know the Font-Types you can create a good svg logo again.

if you look to the DOM of that svg ( svgs are xml based ) you see that i have your brand in an extra group with ID: “Bildmarke”
you can influence inline svgs via quick css!

i think it is part of that discussion here: https://kriesi.at/support/topic/erroneous-output-if-no-logo-is-deposited/

you can try that in the meantime:
this is based on what you entered to customizer as blog name – but you can chante it to a given h1
just insert for : $logo_heading = "Musikschule Jüttner & Co.";

function change_logo_on_empty_logo_input($logo){
  $link = apply_filters( 'avf_logo_link', home_url( '/' ) );
  $logo_heading = get_bloginfo( 'name', 'display' );

  if(empty(avia_get_option('logo'))){
    $logo = '<span class="logo text-logo"><a href="'.$link.'"><h1>'.$logo_heading.'</h1></a></span>';
  }
  return $logo;
}
add_filter('avf_logo_final_output','change_logo_on_empty_logo_input');

and for quick css:

.logo.text-logo a {
  line-height: inherit !important;
  max-height: inherit !important;
}

#top .logo.text-logo a h1 {
  margin-bottom: 0 !important;
  display: inline;
  vertical-align: middle;
}

not before the filter – this is not possible – but with a different way ( that via word count) :

function custom_excerpt_setting(){
?>
<script>
(function($){
// trim excerpt by words
    function trimByWord(sentence,wordcount = 10) {
        var result = sentence;
        var resultArray = result.split(" ");
        if(resultArray.length > wordcount){
        resultArray = resultArray.slice(0, wordcount);
        result = resultArray.join(" ") + "...";
        }
        return result;
    }
    $(document).ready(function(){
        $('.avia-content-slider .read-more-link').each(function() {
            $(this).closest('.slide-entry').find('.entry-footer').prepend($(this));
        }); 
        
        $('.avia-content-slider .slide-entry-excerpt').each(function() {
             $(this).text(function(index, currentText) {
                return trimByWord(currentText);
             });
        });
    });
})(jQuery);
</script>
<?php
}
add_action('wp_footer', 'custom_excerpt_setting');

but as said above – it is better to influence the build process – than to shift it afterwards.
The best place for the read more link is the entry-footer.

PS: it would be nice to have a filter to limit excerpt on both : ALB posts and standard Post by word count.

Nur bei Post oder auch bei Portfolio?

what is your header setting? Logo left menu right … ?