So, aside from using reserved instances... 1. Autoscale with triggers based on utilization. 2. Don't use a full OS if you don't need, consider containers that

So, aside from using reserved instances... 1. Autoscale with triggers based on utilization. 2. Don't use a full OS if you don't need, consider containers that are extremely targeted with your needs only. 3. Services help, you don't need to build everything on your own.