There are zero reasons to limit yourself to 1GB of RAM. By paying $20 instead of $5 you can get at least 8gb of RAM. You can use it for caches or a database that supports concurrent writes. The $15 difference won’t make any financial difference if you are trying to run a small business.

Thinking about on how to fit everything on a $5 VPS does not help your business.

I think we have to re-think and re-evaluate RAM usage on modern systems that use swapping with CPU-assisted page compression and fast, modern NVMe drives.

The Macbook Neo with 8GB RAM is a showcase of how people underistimated its capabilities due to low amount of RAM before launch, yet after release all the reviewers point to a larger set of capabilities without any issues that people didn't predict pre-launch.