Surprisingly, Valve are running an event that is not trying to get you to buy new games. To be fair though, it's not the first time. The Steam Spring Cleaning 2020 event is now live.
Running from now until May 28, the idea is to get you to play through your existing games and clear out your backlog. This links in with their recent Play Next feature to suggest games to you, which graduated from Steam Labs to appear on the Steam Store and as a shelf in your Steam Library. It also pulls in Remote Play Together, for games to share online with friends.
Sadly, a downside is that for Linux gamers it might pull in games from your Library that can't be played (even with the Proton compatibility tool). Testing this myself, it turned out to be the case for me suggesting a few that were completely unplayable. Thankfully with three options each time, you might not get stuck when building up your Spring Cleaning badge. It does, however, highlight that Play Next needs to take into account titles you've set to Ignore on Steam.
Find the event over here.