Use the API if you want some more time with it. You’ll pay for the tokens you use, but twenty bucks gets you some hours of experimentation depending on how fast you’re going.
Not the person you asked, but the OpenAI playground is a great place to start messing with their API, I wrote this to help: https://www.inputoutput.ai/tutorials/openai-playground-guide (note website is still a work in progress just got it going bear with me haha)
However, you need access to the GPT-4 API which you have to request separately. So even if you have GPT-4 with chatGPT Plus you might not have access to GPT-4 through the playground/API.