let res = async function get() {
let a = await web3.eth.getTransactionCount(PUBLIC_KEY, "latest")
console.log(a) // Promise { }
return a;
}

может быть так ?

держи

$(document).ready(function(){
var i = 1;                       
$('.nav-top__list a').each(function(){                     
$(this).attr('id','number'+i); 
i++;                           
})
						
					

var text = ["Welcome", "Hi"];
var counter = 0;
  								
// let elem = document.getElementById("number3");
// var inst = setInterval(change, 2000 , elem );

let elem2 = document.getElementById("number2");
var inst2 = setInterval(change, 2000 , elem2 );


// elem.innerHTML = counter;

function change(elem) {
  elem.innerHTML = text[counter];
  counter++;
  if ( counter == text.length ) {
    counter = 0;
  }

}
})