As someone who has studied and speaks multiple languages, the only way to get better at speaking is to do it. For sentence formation and such, talking to yourself or narrating your day can help. For conversations, you basically need conversations.
This advice is also true for reading; to get better at reading, read me (which I think applies most if your native and target languages use different writing systems. I can read and pronounce Finnish, for instance, but won't know what more than two or three words mean. I find it far more difficult reading Japanese even though I speak it well enough to do basically anything I need to in the language).