Should I use tiered discounts based on cart value?

As a Shopify store owner in the fashion accessories space, I've been wrestling with how to strategically use discounts without eroding my margins. Every time I run a sitewide discount, I notice some customers barely add anything to their cart, while others with higher-value potential get the same flat percentage off. It's frustrating because I want to incentivize larger purchases without seeming too aggressive or desperate. I've seen competitors use tiered discounts – like 5% off orders over $50, 10% off over $100, and 15% off over $200 – but I'm not sure if this actually drives meaningful behavior change. My current conversion rate is hovering around 2.3%, and I know there's room for improvement. I need a solution that feels personalized, creates genuine urgency, and actually motivates customers to increase their cart value without making me look like I'm constantly running fire sales. The challenge is finding that sweet spot where the discount feels like a reward for the customer, not just a margin-eating gimmick.