Congrats screen displays the following when you’ve reached your new card limit:
There are more new cards available, but the daily limit has been reached.
If you’ve finished all your unsuspended new cards but there are still cards left that have been suspended before, something like this can be shown:
There are more new cards available, but they are currently suspended. To study these cards, unsuspend them first.
Similar to what is already done when you have buried cards or new card limit has been reached.
(this one is perhaps more helpful: Congrats Screen Message)