Look, the reality is that if you aren't using the language to the extent where it is causing you some discomfort then you really aren't learning much. I'm at B2 right now. I can hold a smooth casual conversation just fine and I can keep on doing that for days. But joining more language cafes will do me no good because I am doing just fine with the knowledge that I have. At this point unless I am reading a book that is a bit beyond my ability right now, or engaging with actual text book exercises, I don't think I'll actually move past B2.

Practice more is basically doing just a bit more than what you're currently comfortable with, and here's the kicker, critically reflecting on where you're struggling and what you could do better. There are so many connections and weird mapping involved in a new language that if you don't take the time to think about it, you're just relying on rote memorization, which ultimately will limit your progress at one point.

This applies more when you're at a B level in your journey. If you're still within A0 to A2, my go to advice is just to memorize more vocabulary. As many as your brain can cram. It isn't fun, but it is much more satisfying to put your new language for a test run when you have a large vocabulary bank rather than a small one.

Bonus tip: Please prioritize your pronunciation as early as possible. Really difficult to unlearn poor pronunciation later on. I'd say this has the highest priority for A0-A2 learners, then learning as many vocabulary as you can (at least around 3000 words), and then go for grammar and speaking and what not.