Can I create contract-based discount tiers?

I'm looking to implement a more sophisticated discount strategy for my e-commerce business that rewards customer loyalty and encourages larger purchases. Specifically, I want to create a tiered discount system where customers can unlock better pricing based on their total purchase volume or contract-like commitment. This approach would help me incentivize higher-value orders, create a clear value proposition for repeat customers, and potentially increase my average order value while building stronger customer relationships. What are the best practices for designing and implementing contract-based discount tiers?