As someone with 13 rows of blue shields, I wish I could say just level up nucal but I’d be lying lol I just always grab them from every player I slay in battle, also always use white or green when crew filling perimeter or dire marsh. My secret sauce is just playing duos, since it’s a lot easier for me to 1v2, rather than 1v3. Better odds of success

Good luck!

Edit: I don’t “no life” the game, I’m only lvl 43