I was using this inspiring-benz-219a0a.netlify.app/favoritessearch.html for a while but recently it just infinitely loads and was wondering if theres a different way

I don't think there is, no.

www.calculator.net/random-number-generator.html

Change "upper limit" to the number of favourites you have. Click generate to get random number (N), then go to page (N/42 +1) and click on post (N modulus 42 + 1).

If you want an automatic solution... I can't help ye.