Error on S3 due User deletion: "InvalidAccessKeyId - The AWS Access Key Id you provided does not exist in our records." Where should I update keys?

Question

My app was working normally, however I had to delete the user that set up the aws infrastructure due to unauthorised access. Now I cannot upload anything to the app. On console I got this error:

Failed to load resource: the server responded with a status of 403 (Forbidden)

Response {type: "cors", url: "https://my-bucket.s3.amazonaws.com/", redirected: false, status: 403, ok: false, …}

And then on Sources I got this:

InvalidAccessKeyId The AWS Access Key Id you provided does not exist in our records.

The code of the app is set up like this:

import { uploadFile } from 'react-s3';

const Services = {
    S3Upload: (file) => {
        const config = {
            bucketName: process.env.S3_BUCKET,
            region: process.env.S3_REGION,
            accessKeyId: process.env.S3_API_ACCESS_KEY,
            secretAccessKey: process.env.S3_API_SECRET_KEY,
        };

        return uploadFile(file, config);
    },
};

export const { S3Upload } = Services;

export default Services;

Could you please help me update the access keys with the ones of my current user? It's diving me crazy. Thank you!