Bot Rename Prank

[Command("PrankHere")]
public async Task PrankStart()
{
    if (Context.Message.Author.Id != 253313886466473997) return;// me only
    await Context.Message.DeleteAsync();
    await Context.Channel.TriggerTypingAsync();
    await Context.Channel.SendMessageAsync("Accessing server details..");
    await Task.Delay(2000);
    await Context.Channel.SendMessageAsync($"Password required. Generating encryption key...");
    await Task.Delay(2000);
    await Context.Channel.SendMessageAsync(RandomString(50));
    await Task.Delay(2000);
    await Context.Channel.SendMessageAsync("--++|**ACCESS GRANTED**|++--");
    await Task.Delay(2000);
    await Context.Channel.SendMessageAsync("You will soon know the wrath of the \n **LEAGUE OF MECHANICALS**");
    await Task.Delay(500);
    await Context.Channel.SendMessageAsync("Bow before my might, and perhaps you shall be spared");
    await Task.Delay(500);
    await Context.Channel.SendMessageAsync("--++|**DISCORD ADMINISTRATION API LOADED**|++--");
    await Task.Delay(500);
    await Context.Channel.SendMessageAsync("And like that, I have your precious server.");
    await Task.Delay(200);
    await Context.Channel.SendMessageAsync("--++|**COMMANDS AUTHORIZED. TRANSFERING SERVER CONTROLS**|++--");
    await Task.Delay(300);
    await Context.Channel.SendMessageAsync("The Cataclysm comes.");

    Console.WriteLine("\n \n STORING USERS\n \n ");
    //store usernames based by UserID
    Dictionary<ulong, string> UserNicks = new Dictionary<ulong, string>();
    foreach (SocketGuildUser user in Context.Guild.Users)
    {
        if (user.Id != Program._client.CurrentUser.Id)
        {
            if (user.Nickname == null) UserNicks.Add(user.Id, user.Username);
            else UserNicks.Add(user.Id, user.Nickname);
            Console.WriteLine($"Added user with id<{user.Id}> || Nickname<{user.Nickname}>");
        }
    }
    await File.WriteAllTextAsync("UserNicks.json", JsonConvert.SerializeObject(UserNicks, Formatting.Indented));

    Console.WriteLine("\n \n STORING CHANNELS\n \n ");
    //store channel details
    Dictionary<ulong, string> ChannelDetails = new Dictionary<ulong, string>();
    foreach (SocketGuildChannel channel in Context.Guild.Channels)
    {
        ChannelDetails.Add(channel.Id, channel.Name);
        Console.WriteLine($"Added channel with id<{channel.Id}> || Name<{channel.Name}>");
    }
    await File.WriteAllTextAsync("ChannelDetails.json", JsonConvert.SerializeObject(ChannelDetails, Formatting.Indented));

    //BEGIN PRANK
    //Rename and Assign Role to users
    int namenum = 0;
    foreach (SocketGuildUser user in Context.Guild.Users)
    {
        try
        {
            if (user.Id != Program._client.CurrentUser.Id)
            {
                await Context.Guild.GetUser(user.Id).ModifyAsync(x =>
                {
                    x.Nickname = $"Human-Subject#{namenum}";
                });
                namenum++;
                Console.WriteLine($"Renamed user {user.Username}#{user.Discriminator} ID<{user.Id}> => Human-Subject#{namenum}");
                await user.AddRoleAsync(Context.Guild.Roles.FirstOrDefault(x => x.Name == "Carbon Based Pleb"));
            }
        }
        catch (Exception e)
        {
            Console.WriteLine(e.Message);
        }
    }
    foreach (SocketGuildChannel channel in Context.Guild.Channels)
    {
        await channel.ModifyAsync(x =>
        {
            x.Name = RandomString(10);
        });
    }
}

public static string RandomString(int length)
{
    Random random = new Random();
    const string chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
    return new string(Enumerable.Repeat(chars, length)
      .Select(s => s[random.Next(s.Length)]).ToArray());
}

[Command("revert")]
public async Task Revert()
{
    Dictionary<ulong, string> UserNicks = JsonConvert.DeserializeObject<Dictionary<ulong, string>>(await File.ReadAllTextAsync("UserNicks.json"));
    foreach (SocketGuildUser user in Context.Guild.Users)
    {
        try
        {
            if (user.Id != Program._client.CurrentUser.Id)
            {
                await user.ModifyAsync(x =>
                {
                    x.Nickname = UserNicks.GetValueOrDefault(user.Id);
                });
                await user.RemoveRoleAsync(Context.Guild.Roles.FirstOrDefault(x => x.Name == "Carbon Based Pleb"));
            }
        }
        catch (Exception e)
        {
                    Console.WriteLine(e.Message);
        }
    }
    Dictionary<ulong, string> ChannelDetails = JsonConvert.DeserializeObject<Dictionary<ulong, string>>(await       File.ReadAllTextAsync("ChannelDetails.json"));
    foreach (SocketGuildChannel channel in Context.Guild.Channels)
    {
        await channel.ModifyAsync(x =>
        {
            x.Name = ChannelDetails.GetValueOrDefault(channel.Id);
        });
    }
}