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I'm sure you can set up a raspi to deploy this with minimal running costs.

Anywhere you can run Python code basically. Sadly, with the decline of Heroku, I don't know of any places you can run Python code 24/7 for free.

Myself, I run Slack bots on AWS inside a Docker container on ECS (for $day_job) and inside a Docker container on my Synology for personal use.

Google Compute Engine has a free tier. The developer experience isn't nearly as smooth as Heroku though.

You could probably use Cloud Run (it will run a python docker container), it scales to 0

I created a micro framework for slack bots that can be deployed to Lambda here: https://github.com/jtwaleson/minimalistic-serverless-slack-a...

It’s probably a lot less rich than your solution, but feel free to look at it you want to run on serverless.

Maybe fly.io? They have a pretty generous free tier.

I've been having fun using fly.io for a Telegram bot (listens on an HTTPS endpoint like a Slack bot, if I remember right). Has cost me $0 for my hobbyist bot that is only used by me.