if there will be a bundesliga pool again next season (icopress and i haven't talked about this topic yet) every user is very welcome. it doesn't matter if you have already participated this year or not - the more participants, the more fun and the more to win

and as casperBGD already wrote, it is of no benefit for you to want to join this season or it wouldn't be possible anymore
just look for the new pool after the end of the current season/pools here in the gambling section and then register early. there will be enough time again to register for the new season