undefined after async fn

sync.js

function updateUsers() {
   console.log("Updating User Data Across Server!")
   var date = new Date();
   var users =  file.readdirSync('users/')
   for (var i = 0; i<users.length; i++) {
     var links = file.readdirSync('users/' + users[i])
     for (var k = 0; k<links.length; k++) {
       var files = file.readdirSync('users/' + users[i] + '/' + links[k])
       if (files == "instagram.json") {
         var data = file.readFileSync('users/' + users[i] + '/' + links[k] + '/instagram.json', "utf-8")
         var data = JSON.parse(data)
         if (date.getDay() != data.WEEKLY_FOLLOWERS[0].DATE) {
           data.WEEKLY_FOLLOWERS[0].DATE = date.getDay();
           data.WEEKLY_FOLLOWERS[0].DATE = date.getDay();
            getWeeklyInstaLikes(users[i], links[k]).then(() => {
              console.log("For Followers function: " +users[i] + " " + links[k])
              getWeeklyInstaFollowers(users[i], links[k])
            });
         }
         if (data.DAILY_FOLLOWERS[0].HOUR != getHour()) {
            data.DAILY_FOLLOWERS[0].HOUR = getHour();
            getDailyFollowers(users[i], links[k])
            file.writeFileSync('users/' + users[i] + '/' + links[k] + '/instagram.json', JSON.stringify(data))
          }
       }
       else {
         ;
       }
     }
 }
}