function myFunction() {
  var input = document.getElementById("Search");
  var filter = input.value.toLowerCase();
  var nodes = document.getElementsByClassName('connect-cat');


  for (i = 0; i < nodes.length; i++) {

  if (nodes[i].innerHTML.toLowerCase().includes(filter)) {
      nodes[i].style.display = "block";
    } else {
      nodes[i].style.display = "none";
    }
  }
}

function experienceMore() {
    document.getElementById("Search").value = "Experience more campaign";
    }

function firstChoice() {
    document.getElementById("Search").value = "First choice";
    }

<input type="text" id="Search" onKeyup="myFunction()" Placeholder="Please enter a search term...">