Your Light team is more or less complete. Just need to max out the weapon grid and get a decent primary eidolon. I'm not sure I'd even use any Miracle tickets on it other than for SSR Artemis in December. Michael would be useful if you wanted to run a damage-oriented Burst build.

The next team with the most potential is probably Fire, but you'll need Amaterasu to make that work.

The Wind team could also be strong, but you'd need SSR Cybele to make it competitive with your Light team.

But honestly, your Light team is likely sufficient to clear all current content. Michael would add a bit more flexibility in builds so you could play it offensively when desired.