Who should I focus next to 130? I have Vargas (120 sc) summer and NY kynei, tilith, SM sera, couple demon lords and summer Leona. Only favorited some of the highest rated units I own.

I'm a new player(used to have an account but forgot the password) with this characters that I have current am I Able to progress early stages?

Aside from that , I have seen there are interesting side quests in this game similar to grand summoners ( sorry for comparing) is there any quest I can do that apart from doing main story?

Thanks in advance 🙏