1. Choose a runtime that you know how to maintain
Before looking for the fastest one, choose the most readable one for your project. Node.js and Python already cover a large part of Discord uses. The real gain comes from a reproducible environment: fixed runtime version, known dependencies and environment variables separated from the code.
2. Logs, health and restart
An automatic restart is helpful, but it's not enough. If the bot loops on a silent error, it will restart immediately without correcting the problem. It is therefore necessary to combine restart policy, readable logs and health checkpoint.
3. Separate execution, storage and moderation
When a bot grows, its problems no longer come only from the code. Database, temporary files, Discord permissions and logging need to be clarified. The more the project becomes community-based, the more it is necessary to distinguish the application layer from the moderation and support layer.