As long as your bot or node app has a publicly accessible page in it somewhere you can configure a service like UptimeRobot to ping your app’s public page every 5 minutes or so and that will keep your project awake.
I just gave a quick overview of how to have a public page in your project using Express in Glitch.me project appears down even though not - Uptime robot. You could also look at the contents of the hello-express starter project for an example.