This highly depends on the features you'd like the plugin to have. So it's hard to answer just like this.
We can hop on a call and I can see if I find something that suits your needs or suggest ideas how you could solve the problem.
Cheers and make today the day!
The best, most interactive and best UX design for a "book recommendation plugin" shall be one that has an app-like design. An app-like design includes clear icons, buttons, tabs, and navigation that can be accessed at any time. A book recommendation plugin should also have an easy-to-use interface that is easily navigable.
This shall provide them with a greater sense of satisfaction that they are recommending books that they enjoy to other people.
Unfortunately, there is no plugin that can provide you these features but you can achieve it using custom code.
I've successfully helped over 150 entrepreneurs, startups, and businesses, and I would be happy to help you. Please send me more information before scheduling a call - so I can give you maximum value for your money. Take a look at the great reviews I’ve received: https://clarity.fm/ripul.chhabra