First, I would advise you to check Andy Kriebel Visual Vocabulary . Also, I think you should consider that a fancy chart sometimes makes the message harder to understand for the audience. I believe if your data can be displayed in a line chart, maybe instead of looking for another type of chart you could focus on making that line chart engaging and effective. You could check Cole Nussbaumer Knaflic from Story Telling With Data, she uses simple charts but makes them super engaging. There is a lot of inspiration in her site that comes from SWDChallenge, you can check it here. Finally, I would advise you to interact with the Tableau community in Twitter, that is a constant source of inspiration with a lot of great authors and magnificent examples of visualisation.
Hope this helps you.