This is very strange. There is no such limitation. You can create as many projects and environments as you need. You can also add an unlimited number of users
I think there may be a mix-up here with Infisical Cloud which is the managed service with subscription tiers.
Yeah, I've noticed that the app is not enforcing that limit ATM, but the limit was clearly visible in the dashboard when I tried it a couple of months ago (OSS, docker)