Mailchimp API limit in post request

I am working with the mailchimp api. I am running into a problem where i exceed their limit of 10.
In the get request you can solve this with pagination and offset. But how can you solve this in a post request, it’s not like you can have pagination in post requests..

This is how my code is running :

allEmails.forEach(email => {
    const emailHash = md5(email); 
    if(mailChimpMails.indexOf(email) === -1) {
        mailChimpPost('POST',`lists/4d2d65c130/members` , JSON.stringify({"email_address" : email , "status": "subscribed"})).then( res => {
            console.log(res);
        }).catch(err => {
            console.log(err); 
        });
    }else{
         mailChimpPost('PATCH',`lists/4d2d65c130/members/${emailHash}` ,  JSON.stringify({"status": "subscribed"})).then(res => {
             console.log(res)
         }).catch(err => {
             console.log(err); 
         });
    }
})

All emails is an array of emails which i loop through and add them individually to my audience in mailchimp. It adds a few but after a while of running it throws an error of 429 :

statusCodeError: 429 –
"{"type":"http://developer.mailchimp.com/documentation/mailchimp/guides/error-glossary/","title":"Too
Many Requests","status":429,"detail":"You have exceeded the
limit of 10 simultaneous
connections.","instance":"myinstance"}"