You have a good team there, but like some people said, stop leveling Stego and Triceratops - Their hybrid Stegoceratops is better than both of them together. You should also level up Einiasuchus and get her on your team, she is really amazing, she is one of my best dinosaurs and I’m in arena 7 thanks to her. Delta is great but a bit low level - I don’t know if she is good enough for your current arena, if you see she dies too fast replace her. Dilophosaurus isn’t good enough in my opinion. As for Stegosaurus, she is a good raptor counter so keep her on your team next to Stegoceratops as long as she is useful. So in summary:
-Replace Triceratops for Stegoceratops
-Replace Dilophosaurus for Einiasuchus
-Keep Delta and Stegosaurus for as long as they are useful - otherwise replace either of them for Ouranosaurus.