1. Ligonier ministries (the teaching fellowship of R.C. Sproul) has a small devotional on humility.
https://www.ligonier.org/learn/articles/growing-humility/
2. The national Catholic register has a devotional type article on Mother Theresa’s 15 tips on becoming more humble.
http://www.ncregister.com/blog/armstrong/mother-teresas-15-tips-to-help-you-become-more-humble
3. Andrew Murray’s book “Humility: The Beauty of Holiness” is often referenced as a treasure trove of wisdoms among people who are focused on learning about humility. It’s a short book with 12 chapters and could easily be read 2 chapters a day for a week. You could download it to your Kindle, purchase it, or a free version is available at:
https://www.sermoncentral.com/scdownloads/humility_andrewmurray.pdf