https://www.booksfortopics.com/year-4
https://www.thereaderteacher.com/year4
https://www.lovereading4schools.co.uk/lists/34/Year-4-age-8-9 This link is especially good as there is often a free excerpt of the book to capture your interest!
Try following along the author 'lines' and see where it intersects with another author. The new author's books may be written in a similar style or may follow a similar theme. Maybe you could challenge yourself to read books from all the 'stops' over the next two years or even create your own tube line of recommended reads?