Rather than going for the big thing in software, you should probably try to understand what is the area that interests you and spend more time on topics in that area to compound your knowledge. Always going for the "next big thing" in software will help you gain familiarity with a lot of topics but you risk being spread too thin.

That being said, from the HN community I have seen a lot discussions on Rust programming language. Picking up project to learn Rust can be a good idea to be familiar with the latest trend.