Can we please just once and for all dismiss this delusion that new players need to “catch up” to older players. They don’t compete against older players in squad or fleet arenas. In raids and tb they fight together with others in guilds and develop to gradually progress and eventually beat that content just like those older players had to do. In grand arenas they are pitted against players based on their strongest toons, so any “catching up” they would get help with would automatically pit them against stronger players anyway.
Therefore, there is no catching up to do, there is game content to gradually progress with as you develop your rosters. Just as it has been for everybody else in the past and will be for new players in the future (until they stop developing new content).