Azwan now or later?

What I suggest maybe considered drastic, but given that you have close to 6 months to prepare, I'd delete your Wind Archer and remake it. Level only up to level 119 so you don't get thrown into the 120-159 level bracket. But as others have said, now is the best time. Obviously, if you have well scrolled untradables this can be a problem and I'd also make sure you can solo on a 119 or lower character or all that deleting will be for naught.