tl;dr; Check out Next.js Boilerplate — Simple on GitHub.
I've got most of my projects working in this setup now, and so as I was starting to work on a couple of things more recently, I decided to pick one that I've had in production for a few months without issues, strip it to the bare essentials, and update all dependencies.
It's in GitHub at github.com/BrunoBernardino/nextjs-boilerplate-simple.
If people find these useful, I'll start a collection and release some with basic stuff like connecting to MongoDB, sending emails via Mailgun, passwordless user login, and more.
Note from July 2020: I've created another Next.js Boilerplate, now using FaunaDB and ElasticSearch, and now you can see more in this Next.js Boilerplates list!
Let me know what would you like seeing more!
I hope you enjoy it.
Thank you for your attention and kindness. I really appreciate it!