Hello, I have a history website http://history-maps.com/ using Nextjs 12.2.4 (not using 13 yet) and Firebase Firestore (version 8) as a data store. Recently, the traffic just doubled and my Firestore fees went up dramatically. While this is a nice problem to have, I would still like to know my options on how to reduce costs and I was hoping Nextjs caching can help. Note: due to the nature of my website, the data doesn't really change that much, apart from corrections and new updates. It's not like a news or ecommerce site.

1. I'm using getStaticProps revalidate option. At the moment, I am revalidating each day. If I up this to revalidate after one month, does that mean the data for the page the getStaticProps is in will cache the data for 1 month, so it won't hit the Firestore if the data has already been cached?
2. If I redeploy my app with a simple change, does it purge the whole cache and essentially start the cache all over again?
3. If I do redeploy, is this one way to update whatever data I may have changed?
4. is there any benefits to fetching the data using serverless functions?

Thanks for any guidance on this.