@Ari I think it's going to be difficult to find a written resource for that which is truly helpful. I found three things helpful in aiding my listening / conversation abilities: (1) talking with friends, (2) J-dramas, and (3) some anime. But regarding (2) and (3), you should try to find them without subtitles or cover the subtitles. Then rewatch with and test your listening comprehension. Textbooks as written materials are less helpful for understanding listening, etc.