Maybe my suggestion won’t be that usefull but…
I think the problem of alch for team playing is lower damage in comparison to other classes, no matter if it’s cryo 3 or ele 2. Alche c1-2 make you simply reject 2 damage class upgrades that could’ve done you decent against other TONS of damage dealers.
I’m currently C1 alche through support build wiz-pyro-link-trauma c2-alch. I can soloing, but it goes kinda rough. I can do quests, but killing mobs kinda long and painfull (long cd, low damage, even with me being full int) Grinding solo is impossible (although most people grind in parties)
But being support is a different. Trauma/chrono sup skills kinda nearly best in the game, very few go there, so support easier can find slot. Restriction of -1c in trauma is not much - i’ve in highest ~ -100atk or 60atk+30def in comparison to the max trauma, and do not swell int. Still i can give pretty high damage to my party members and swell to double exp.
Back to the topic, i would suggest you to go through sup, and forget about damage build =3