Shopify Aftersell and upsell

I am looking for a Shopify expert to help me with the aftersell and upsell process for my online store.

Features to include in the aftersell and upsell process:
- Related products suggestions
- Discount offers

Thank you page:
- I am open to the designer's creativity

Upsell process:
- More than 7 products should be included

Ideal Skills and Experience:
- Strong experience with Shopify and its app ecosystem
- Knowledge of upselling and aftersell strategies
- Design skills to create an appealing and effective thank you page