Try this snippet in your child-theme functions.php:

function ava_exclude_current_post($query) {
  if (is_singular('post') || is_singular('portfolio') ) {  
    $exclude = avia_get_the_ID();
    $query->set( 'post__not_in', array($exclude) );
  }
}
add_action('pre_get_posts', 'ava_exclude_current_post');

// in the if-clause you can use aswell  :   if(is_single()){
 

There can be several reasons why Google Fonts are loaded externally.
First of all – have you activated your uploaded fonts at the end of the list in Enfold – Fonts? – Many upload Open-Sans but then select the default font in the list instead of the uploaded one.
2.) try this snippet in your child-theme functions.php:

function my_output_google_webfonts_script( $activate ){
  return false;
}
add_filter( 'avf_output_google_webfonts_script', 'my_output_google_webfonts_script', 10, 1 );

3.). If you are using Google Apps ( Maps, ReCaptcha, Analytics etc. pp) these apps can download their own fonts via Google Server!
a) you can use for gmaps on child-theme functions.php:

add_filter( 'avf_gmaps_no_google_fonts', '__return_true' );

4.) …. better you tell us what you use from Google as an app to give further advice to prevent fonts from loading

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?