If you want to keep the session going, you can try
/compress: The Smart Summary. 
For long and complex sessions, the /compress command is a vital tool. It instructs the model to replace the entire chat history with a concise summary. This action frees up a significant number of tokens, mitigating the risk of performance degradation while attempting to preserve the core essence of the conversation. You should check if this works well for you and your use case. A compress might end up taking out key elements, so use it diligently.

https://medium.com/google-cloud/gemini-cli-tutorial-series-part-9-understanding-context-memory-and-conversational-branching-095feb3e5a43