I have data that already saved at mongoodb atlas, but i dont know how to get and display that data to my bot discord reply.

This is how i submit the data

const subregis = "!reg ign:";
client.on("message", msg => {
  if (msg.content.includes(subregis)){ 
      const user = new User({
        _id: mongoose.Types.ObjectId(),
        userID: msg.author.id,
        nickname: msg.content.substring(msg.content.indexOf(":") + 1)
      });
      user.save().then(result => console.log(result)).catch(err => console.log(err));
      msg.reply("Data has been submitted successfully") 
  }
});

This is my schema

const mongoose = require('mongoose');
const Schema = mongoose.Schema;
const profileSchema = new Schema({
    _id: mongoose.Schema.Types.ObjectId,
    userID: String,
    nickname: String,
});

module.exports = mongoose.model("User", profileSchema);

And i want to show the data like this, i try this code but didnt work.

client.on("message", msg => {
  if (msg.content === "!nickname"){ 
      msg.reply("Your Nickname:", User.findById(nickname))
  }
});