Sending message to all my contacts on whatsapp using whatsapp-web.js

Question

Hi I´m currently doing a code to send a message to all my contacts, I've been able to send a message to only one contact, do anyone know a way to automatize this, for example send a message to my first 5 contacts, or all my contacts?

Here is my code:

client.on('ready', () => {
    console.log('Client is ready!');
    client.getChats().then((chats)=>{
        const myGroup=chats.find(
            (chat)=>chat.name==="Whatsapp automation"
        );
        client.sendMessage(
            myGroup.id._serialized,
            "This is an automated message"
            );
    });
});

If someone could me, I will be too grateful, thanks so much for your attention