recap (summary, return to main idea)

revisit your main idea, perhaps in more detail of with a change in emphasis. If you like, strengthen the cause-and-effect relationship in your thesis.

take your main point and apply it to a broader topic. Connect it to issues outside the scope of your main argument. However, don't introduce a new claim (cause0and0effect statement). Just show us how your earlier claim can be applied to a broader category of stuff.

To finish your conclusion, help us evaluate your idea. Show us that it provides a significant and meaningful answer to an important question. You have already successfully answered a question. Now you must show us why the question mattered.