Error 4200: Error from the ChatBot code 429 You have exceeded your free usage today,

I keep forgetting this error, incorrectly. It gave me this error when I first woke up, and tried to use my app today. I started this project after I got my own API key from Google. I immediately entered my personal API key, and I chose the model: Gemini 2.0-flash. it worked fine for a while. Now, I keep getting denied, and it's showing me this error:

Error 4200: Error from the ChatBot code 429 You have exceeded your free usage today, more information at Creating a Chatbot OpenAI Account and an API Key (I visited that site, but I have already gotten my own API key)

Should I try to use a different model?