Analyzing Return Rate

You're the E-commerce Manager for a home decor brand that specializes in contemporary furniture and accessories. The brand has been selling online for 3 years and generates $5 million in annual revenue across various e-commerce platforms.

Your bestselling product, a modular bookshelf, has recently seen a significant increase in return rates on Flipkart, one of your main revenue channels. This surge is hurting both the product's economics and your seller rating on the platform.

→ What are your top 3 hypotheses for this increase in return rates?
→ What specific data points do you need to validate these hypotheses?
→ Where will you source this data from?

See hint