To avoid over-optimizing cloud costs, you need to balance cost optimization goals with software design objectives and requirements, as well as monitor and measure cloud usage and performance. Additionally, define and prioritize software design criteria and metrics, such as functionality, reliability, security, usability, scalability, etc. Estimate and budget cloud costs based on these criteria and metrics while allocating sufficient resources and contingency funds for software needs. Utilize cloud cost optimization best practices like selecting the right cloud service level, using reserved or spot instances, leveraging autoscaling and load balancing, applying tags and policies, etc. Review and evaluate cost optimization results regularly in comparison to software design criteria and metrics while identifying any gaps or issues that may arise from cost optimization decisions. Finally, experiment with new or alternative cloud services, tools, or frameworks that could enhance software design and value proposition while weighing their costs and benefits against current solutions.