Need suggestions for a Wayside School loving 5 year old.

I recently started reading chapter books to my 5 year old. We started with Charlotte’s Web. Next we read Sideways Stories from Wayside School. He LOVED it. Next we read the first Boxcar Children book, and then read Wayside School is Falling Down. We then started another Boxcar Children book, but he wanted to go back to Wayside, so we read the remaining 2. Since finishing that series, we’ve tried Dogs Don’t Tell Jokes (The only other Louis Sachar the library had at the time), one of the Stick Dog books, and Maniac Magee. He keeps losing interest and asking if there are more Wayside books.

So I need suggestions for books that he will find as funny and engaging as Wayside School, with the characters preferably being elementary-aged (I think this is why he didn’t like Dogs Don’t Tell Jokes, because they were middle-school aged).

Thanks!

by Former-Suggestion782