What's the best times to get new players to join this server?

I been on this server from the beginning so I never had this issue. Although, it seems hard to get friends who are new to the game to play on this server due to always getting restricted. It's leaving a horrible impression when the first message he gets when trying join the server is that it's blocked to new players. It's been weeks and he still can't make a character on this server. Is there a window of opportunity to join? I'd hate for him to quit before even starting especially having to drop all this cash on this game.

I surprisingly was able to get into the server during the daytime around noon, but this was a weekday when most people are at work. Another free time should be around 4-7a.m.