They had Unreal Tournament 4 in development around 2018 but it never gained much traction in the pre-alpha phase. Once Fortnite blew up they seemed to just focus on that and their app store.

https://www.youtube.com/watch?v=q3botRkqnwk

I think the Unreal Tournament 4 team was moved to Fortnite after the success of PUBG to rapidly turn it into a battle royale.