I was at the 20GB storage limit several times and compress the images in my Base to get below 20GB again. Here is a Tutorial I created: https://www.youtube.com/watch?v=U_RJhZ8JvJk

I made a video-tutorial on how to compress images in Airtable. You could build an automation to make this by default. This should make sure you are below 2MBhttps://www.youtube.com/watch?v=U_RJhZ8JvJk

I ran into the same issue with the DATEADD formula and a looked-up value as the count. An easier workaround is to multiply the looked-up value by 1. At least that worked for me.