1) When we were making Starting Pack, we were thinking about adding 7 days PA, but at the same time, we thought it can discourage people, because after these 7 days, they will be obligated to buy it again in order to play with both chars they made. About topic - we have it: https://l2classic.club/forum/topic/22220-it-was-never-so-easy-to-join-l2classicclub/
2) We are thinking how to help newbies and encourage them to start and climb to a level of old players, I can't announce anything specific yet, but this question is under our current discussion.
3) We have a team that works on our advertisement. Based on statistics: conversion from sites you listed is small and not worth the money you have to pay. So currently we are spending most of our advertisement budget on the most beneficial ones, such as Google ADS, Bing, Yahoo.
But as always, if players have ideas - please, share them with us.