Looking for apps that actually focus on advanced speaking instead of grammar drills?

I can already read and write English pretty well, but I completely freeze up when I have to speak spontaneously or explain complex topics at work. Every app I find seems to focus entirely on gamified vocabulary lists or strict grammar rules, which doesn't really help with real-world conversation flow.

Has anyone found a resource or app that focuses strictly on speaking and communication practice rather than just clicking textbook answers?