the reference answer GPT ᴼ ᴾ ᴱ ᴺ ᴬ ᴵ < br / > Repl. It is an online platform for the development, the free version is to use time limit. If you want to keep your program running, consider the following methods:
Use other cloud providers. You can use free plans offered by Cloud providers like AWS, Google Cloud Platform, or Microsoft Azure. These packages often include limited computing resources and storage space, but they can keep your applications running for a long time.
Use platforms such as Heroku or Glitch. These platforms provide free virtual machines and servers to keep your applications running. Flask applications are also supported on these platforms.
Run the application on your own server. You can purchase a virtual private server(VPS) or cloud server and then install a Flask application on the server. This requires some technical knowledge and the ability to maintain the server.
Note that you may have to deal with some limitations and instability when using free services. Therefore, if you need better performance and stability, it is best to consider purchasing a paid service.