Here are some WordPress shop themes that were well-regarded for boosting online stores. Keep in mind that the popularity and effectiveness of themes can change, so it's advisable to check for the latest reviews and updates:

• Flatsome:

• Flatsome is a highly popular and versatile WooCommerce theme known for its user-friendly design and customizable options. It's optimized for conversions and provides a great shopping experience.

• Porto:

• Porto is a responsive and highly customizable WordPress theme designed for e-commerce. It comes with multiple demo layouts and a variety of features that make it suitable for different types of online stores.

• TheGem:

• TheGem is a multipurpose theme with a strong emphasis on creative design. It offers a variety of pre-built templates, including several for e-commerce, making it suitable for a range of online stores.

• Enfold:

• Enfold is a clean and responsive theme that includes a drag-and-drop builder. It's versatile and can be used for various purposes, including e-commerce.

• Shopkeeper:

• Shopkeeper is specifically designed for online stores and features a clean and modern design. It comes with a page builder for easy customization and integration with WooCommerce.

• WoodMart:

• WoodMart is a responsive theme built with a focus on creating a seamless shopping experience. It offers various shop layouts, customizable headers, and compatibility with popular page builders.

• XStore:

• XStore is a feature-rich theme designed for e-commerce websites. It includes a variety of layouts and styles, along with a user-friendly customization interface.

• Jupiter:

• Jupiter is a multipurpose theme with a wide range of customization options. It's compatible with WooCommerce and offers various pre-designed templates suitable for online stores.

Always check for the latest reviews, updates, and compatibility with the latest WordPress and WooCommerce versions when choosing a theme for your online store. Additionally, make sure the theme aligns with your branding and provides a positive user experience for your customers.