Express server went down and can't be pinged

I was running a Discord bot on Replit, and I tried to use keep_alive.js file, google apps script , and uptime robot to let the bot online for 24/7. However, the bot still went down after a few hours.
When I opened the file and looked at the web section, there were no texts. I have no idea what cause this.
There is my file: index.js

Hi @Tobydog0501 thanks for your message!
Have you got “Always on” selected for the repl?

I don’t have hacker plan so I can’t select “Always on”

Hi @Tobydog0501 then as far as I know you won’t be able to always have your Repl running.

I see, thank you for answering my question.