I was in your shoes a few years ago. Started learning from other engineering leads and some of their practices included:

- 30-min sessions to introduce new learning, from a blog post, a tech conference, or a book;

- Technical agile coaches;

- 2 to 3-day, 10-people training sessions;

- E-learning platform;

- Wiki;

- Linters and code analysis tools;

- Code reviews;

- Pair and mob programming sessions;

- Coding Dojos;

- Technical communities, or communities of practices;

- Craft Workshops;

I got so into it that I wrote a series of blog posts on how to create a learning culture in software engineering teams: https://www.promyze.com/set-learning-culture/

Sorry to plug my own thing, but poured months into it, and genuinely thought it would help you!