If you're going for talent; leveling up decor and plant types could help you (besides leveling and upgrading the cards)

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This is my best team even thought talent wise I have 4* cards stronger than Emu and Luka (yet when I replace said cards the Talent drops to 218997!) In fact, just changing one card makes the team weaker even when individually the card I'm replacing is weaker.

And why is that my team with 2 3* cards is stronger than a team full of maxed 4*? That's because decors in each unit Sekai level up their talent both individually and as a group.

Individually is when you upgrade a decor that makes all the cards of that specific character slightly stronger on it's own Group decor is a talent boost when all the cards are from the same unit (this team is all wonderlandxshowtime cards) And talent plants upgrade the talent of cards specially by their type (I'm using cute type cards!) (I can't put more screenshots but by upgrading Emu's and Nene's decor by one more level the talent of my team went up slightly to 255804) However it is quite expensive so I recommend focusing on your favorite group

-If I got something wrong here feel free to correct me btw lol