Advanced Java material to get better?

I have around 6 years professionnal experience and I feel like I start to lag behind in the best practices for Java/Spring-boot, mostly due to the fact that I have little occasions to work on something interesting and challenging at work, like optimization for example.

I'd love to know what material (video, pdf, ...) I can use to actually get better at using design patterns and the latest Java versions.

I'm already looking at the documentation and trying to learn from it.
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