Repl projects are automatically turned off when close the window, or after 5 minutes of inactivity. And UptimeRobot trying to wake it up in every 5 minutes. So you can just leave it even if it's not ...

Welcome to the Aternos-24-7-Bot project. This bot uses Mineflayer to keep your Aternos Minecraft server running all day, every day. It connects to your server with your chosen IP, port, and password.