Jessica would make sense as a Titan despite having already been a Justice Leaguer - she's probably younger than Kyle is.
Power Girl of course just started working with Omen.... who unfortunately would be redundant to Raven so clearly won't be joining up any time soon. There's no reason for PG to join without Lilith - especially as she's already active with the JSA. Whereas Supergirl isn't on any team right now.