I've spent two days working on a bot... only to realize, I won't get away with running it 24/7 for free. Unless, someone knows of "a trick" - Can't really be paying for hosting at the moment. (not much, at least)
Maybe you can set up a fee tier on AWS? Have no idea how resource intensive the bot is or what it does so it's just a guess in the dark.
I'm using the free tier from Oracle for some hourly sql query scripts. Works well, but these are not resource intensive.
You do need a CC to register, but the service is free.
its a welcoming bot for the Hive Ecuador community... it would be listening to specific posts with specific metatags and keep a list of curated posts. this is for onboards. I have it working at the moment, but replit kills it after 30 min or so.
Oracle has a pretty generous free tier: https://www.oracle.com/cloud/free/
You could also keep rotating it on multiple VPS provider's free trial(Digital Ocean, Hetzner, Vultr, etc).
At the end of the day though, VPS are pretty cheap and it might just be better to pay for one.