Need your help in making the AI Model responses more effective

Is there any specific Prompt template for LLM to understand? In my case, I used Google Gemini-Pro LLM for building an AI model to answer user queries related to my product, I used LangChain framework to invoke my product APIs using Agent and Tools. How can I improve the performance of my model in terms of answering with actionable insights?

Am I using the right model for LLM? Should I replace with Meta Llama LLM model? If so, how to do fine-tuning?

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