In the absence of direct communication, you can use the following strategies to convey that you have information that threatens your opponent: 1. **Indirect hints**: Post some suggestive information or quotes through social media, forums or other public platforms to let your opponent know that you have some important information without revealing the specific content. 2. **Show strength**: Demonstrate your ability in a certain field through your own behavior or performance. For example, show your professional knowledge or skills in a competitive situation to make your opponent feel potentially threatened. 3. **Use a third party**: Indirectly convey information through mutual friends or colleagues. Let them mention the information you have in their conversation with the opponent. 4. **Create suspense**: At the right time, leave some clues for the opponent to arouse their curiosity. Let them take the initiative to explore and guess what you know. 5. **Strategic behavior**: Take some strategic actions, such as adjusting your plans or goals, to indicate that you have important information, thereby attracting the attention and vigilance of the opponent. 6. **Seek consensus**: Try to reach a consensus with the opponent on certain key issues without directly revealing information, which may make the opponent feel that you have a deeper understanding. In short, it is important to maintain a sense of mystery and ambiguity, while at the same time being clear enough to make the other party feel potentially threatened.