Related: Can't deploy using CLI: Failed while uploading blobs to deploy store. The issue as per their description was:
every single page in the website, as generated by Next.js, is 17MB!!! That’s because Nextjs prerenders all pages and loads them all in every single page. every single page in the website, as generated by Next.js, is 17MB!!! That’s because Nextjs prerenders all pages and loads them all in every single page.