It seems like you only registered the ping command. You have to register each slash command individually.

I guess you registered the slashcommand some tile earlier, and have not removed it since. You are only responding in your code example to slashcommands, but you have to create them in the first hand. Check here on how to do that.

it may take up to one hour to register a global command tho, so be patient. If you are fine, with slashcommands for one guild only, you can also only create guildCommands. These are up and running within a view minutes (under 10minutes max)

Here is a simple command, with which you can update the slashcommands (this is staright from the docs)

client.on('messageCreate', async message => {
    if (!client.application?.owner) await client.application?.fetch();

    if (message.content.toLowerCase() === '!deploy' && message.author.id === client.application?.owner.id) {
        const data = [
            {
                name: 'ping',
                description: 'Replies with Pong!',
            },
            {
                name: 'pong',
                description: 'Replies with Ping!',
            },
        ];

        const commands = await client.application?.commands.set(data);
        console.log(commands);
    }
});

NOTE: you have to be running the master branch of discord.js (aka Discord.js V13). If you have not installed it yet, you can install it by running: npm install discord.js@latest. Make sure, you have uninstalled the "normal" discord.js dependency beforehand, by running npm uninstall discord.js.

If you are not sure what version you currently have installed, simply run npm list

This worked for me, the idea is to render each command separately.

I also went for some hardcoded configs: guild_id & client_id (to win some time in dev mode)

const { Client, Collection, Intents } = require('discord.js');
const { token, client_id, guild_id } = require('./config.json');

const client = new Client({ intents: [Intents.FLAGS.GUILDS, Intents.FLAGS.GUILD_MESSAGES] });

client.once('ready', () => {
    console.log('Ready!');
});


client.on('messageCreate', async message => {
    if (!client.application?.owner) await client.application?.fetch();

    // => client_id was just a quick fix, the correct value should be the id of the guild owner(s)
    if (message.content.toLowerCase() === '!deploy' && message.author.id === client_id) {
        const data = [
            {
                name: 'ping',
                description: 'Replies with Pong!',
            },
            {
                name: 'foo',
                description: 'Replies with bar!',
            },
            {
                name: 'chicken',
                description: 'Replies with sticks!',
            },
        ];

        // same here, guild_id should also be replaced by the correct call to the idea number, just as client_id in this code!
        for (let i = 0; data.length > i; i++) {
            await client.guilds.cache.get(guild_id)?.commands.create(data[i]);

        }
    }
});
client.on('interactionCreate', async interaction => {
    if (!interaction.isCommand()) return;

    const command = interaction.commandName;

    if (command === 'ping') {
        await interaction.reply('pong')
    } else if (command === 'foo') {
        await interaction.reply('bar')
    } else if (command === 'chicken') {
        await interaction.reply('nuggets')
    }
});

client.login(token);