Not too sure what you're asking. Gaining quartz takes time when you're not buying them with real money. People save up for months to roll on a banner they like. You don't even need to be doing 30 rolls either, if you really want to roll for a servant on a banner.
If you're F2P just be doing your free quests as they give quartz and then just slowly collect the ones you get from login bonus and weekly master missions.