The next freebie that you can grab on the Epic Games Store is a lovely co-op game, Overcooked. This version is local-only, though, unlike the sequel.
The game is best enjoyed with (at least) one other person, so make sure you have a friend, colleague, or maybe your romantic partner nearby. Overcooked 2 is a better game, but the first one is still extremely fun and its strength lies in simplicity.
You can claim your freebie until June 11, so if you're planning to do it, you have 6 days left. Based on some leaks that we are getting, the next freebie could be Ark: Survival Evolved. But only time will tell if that's true or not.