I’ve been looking for a feature like this, but this is not it… In the past I’ve used 3rd party sites to do the same thing and they work way better. I don’t think it’s implemented very well at the moment. Out of the 7 or so games it suggested, I would maybe consider playing 1.
http://steamadvisor.com reads your library and and looks for games you’ve played for up to x amount of minutes and recommends based on review scores or most common recommendations. You can filter by time played and add to an ignore list.
It’s way better than steams thing IMO.
There are other as well, https://whatshouldisteam.com/ seems very customizable. I’ve only really used Steam advisor.