I like the idea of random topics, but I suppose there should be tweaks to be made.
My forum is 20+ years old and it would be weird to have a page with a bunch of random topics older than a decade.
If you want to target topics with low engagement, there should be a parameter like the max number of replies to show up.
Even so, it doesn’t mean that all these low-engagement topics are interesting.
Do you want to target topics on some criteria, or just… Random ones?
The closest thing that exists lies in the category settings:
It was (maybe still is?) used here on Support, as a Support topics’ ideal state is solved/closed. Open topics here typically means that no solution was provided, so it gives a chance to low-engagement topics to be looked at, even if it is months of years after - it can always be valuable.