enter image description hereHow do I change the user ID to a username? I don't have the username saved in my DB.

const leaderboard = await mongoCurrency.generateLeaderboard(1, 10);
    
    if (leaderboard.length < 1) return message.channel.send("Nobody's on the leaderboard.");
    
    const mappedLeaderboard = leaderboard.map(i => `${client.users.cache.get(i.userId) ? client.users.cache.get(i.userId) : "Nobody"} - ${i.coinsInWallet}`);
    
    const embed = new MessageEmbed()
    .setTitle(`Arcafe Global Leaderboard`)
    .setDescription(`${mappedLeaderboard.join('\n')}`);
    
    message.channel.send(embed);
}