Making a bookmarklet to click all the 'more >' links on Word Hippo, doesn't wait between clicks

Question

Here is what I have, that I've been running in the console (I've added linebreaks for readability):

let thingsToClick = []; 
// sleep function from https://stackoverflow.com/a/64762041
const sleep = t => new Promise(s => setTimeout(s, t)); 
do{
    (async () => {
        thingsToClick = $$('div.morewordsblock[onclick]:not([style])');
        console.log(thingsToClick.length);
        thingsToClick.forEach(async clickable => {
            console.log(clickable.id);
            clickable.click();
            // wait between clicks
            await sleep(5000);
        });
        console.log('waiting'); 
        // wait between rounds of clicking
        await sleep(5000);
    })();
} while (thingsToClick.length >=0);

The problem I have is that it's not actually waiting in either case, and just hammering the page, meaning it doesn't have time to respond between loops.

For completeness I've been running this on https://www.wordhippo.com/what-is/another-word-for/peach.html