can anyone suggest other AI models if chatgpt is not helping

ChatGPT is by far the most advanced. If basic ChatGPT, which is based on GPT-3.5, is not doing what you want, then you might try ChatGPT-plus, which is based on the much more powerful GPT-4.0 (although it costs U.S. $20/month). I don't think any other LLM has been trained on nearly as much verilog code as GPT.