Tried a lot of solutions (like these https://dev.to/dailydevtips1/javascript-loop-queryselectorall-results-j6) but can’t get the loop to work in GTM/Google Tag Manager.

My working script – not very good of course

var helloUrl = document.querySelectorAll('a[id*="hellotracklink"]')[0];


helloUrl.href = helloUrl.href + '?utm_source=' + utm_source + '&utm_medium=' + utm_medium +  '&utm_campaign=' + utm_campaign + '&utm_term=' + utm_term + '&utm_content=' + utm_content + '&lpurl=' + lpUrl;
  
var helloUrl = document.querySelectorAll('a[id*="hellotracklink"]')[1];

helloUrl.href = helloUrl.href + '?utm_source=' + utm_source + '&utm_medium=' + utm_medium +  '&utm_campaign=' + utm_campaign + '&utm_term=' + utm_term + '&utm_content=' + utm_content + '&lpurl=' + lpUrl;
  
var helloUrl = document.querySelectorAll('a[id*="hellotracklink"]')[2];

helloUrl.href = helloUrl.href + '?utm_source=' + utm_source + '&utm_medium=' + utm_medium +  '&utm_campaign=' + utm_campaign + '&utm_term=' + utm_term + '&utm_content=' + utm_content + '&lpurl=' + lpUrl;
  
var helloUrl = document.querySelectorAll('a[id*="hellotracklink"]')[3];

helloUrl.href = helloUrl.href + '?utm_source=' + utm_source + '&utm_medium=' + utm_medium +  '&utm_campaign=' + utm_campaign + '&utm_term=' + utm_term + '&utm_content=' + utm_content + '&lpurl=' + lpUrl;

• My failing script in GTM*

var helloUrl = document.querySelectorAll('.hellotracklink');

  
  for (var i = 0; i < helloUrl.length; i++) {
  helloUrl.href = helloUrl.href + '?utm_source=' + utm_source + '&utm_medium=' + utm_medium + '&utm_campaign=' + utm_campaign + '&utm_term=' + utm_term + '&utm_content=' + utm_content + '&lpurl=' + lpUrl;
}