Yeah, it's a very common cycle for early access titles. I'm really hoping that everyone enjoys the work we've put into the new update when it goes live for all players. Ready or Not was definitely a surprise hit for us, especially having released it earlier than we'd liked to. Plus, while the single player currently isn't nearly as fun as coop (since cooperative environments are social), that element will always exist for people to play regardless of player counts.
We don't live and die by our player counts as much as a strictly PVP-based game, for example (see Splitgate, which is a bunch of fun but began to wane in player count after a while).