Just curious... are you using it for a personal project or is it part of a requirement for a role/employment?

I've seen this happen: https://www.reddit.com/r/ProgrammerHumor/comments/w4eo12/usi...

I don't have any great pointers unfortunately, though I met someone not too long ago who has a product to help with monitoring AWS costs: https://www.cloudforecast.io/

Disclaimer: I've never used this tool as I don't use AWS but if I did have to use AWS, I would likely try something like this at least early in the game to avoid getting rekd.