Can I redo quests on ALTs to get material?

[KinKin25]

You know, the quests that give you useful mats to do my main that I'm using right now. They were barely enough so if they don't give me those quests, how do I build my alts? I think each alternative character that you have should be able to repeat to get those materials.

[lollars]

if you use alt do the tower if you want materials

[RotherHans]

The roster quests just like all the island are account wide, you can't redo them and nobody wants to.
Look up utube guides to figure out the proper way of farming your stuff.