Counter thought: Trying to keep up is keeping you behind.

If you're in a stable employment situation, diving deeper into existing things you use will be more beneficial than knowing the tip of 10 different icebergs.

Learning something by doing a hello world or building a todo list app really skims the surface of what its like to work with that tech on a constant basis. After working in software development for a couple decades, I have the mindset that I can learn any of these if I need to, the underlying tech doesn't change that much.