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That's actually a really great question to ask. I've written about my thoughts in several past TBTs, but I'll try to outline some points for you here. First of all, they need to establish a committee to form a coherent plot. Each films could have their own tone, but they should all be cohesive. Secondly, they should just stop competing with Marvel because they are too far ahead, and staying competitive is what led to the disaster that is the DCEU. If they want to continue the multiverse route, they should be consistent with it, instead of just patching things up. Stop with the political correctness and try to do some fan service to win people back. Lastly, focus on legacy so that there's continuity. Bonus points if they can incorporate their TV properties in their massive crossover.

Yeah I think they should stop the competition and get creative too because originality matters a whole lot and they've lost it when it comes to originality as well.
Marvel is quite on another league of their own and they were blistering before they attained this height

Believe it or not, DC has been eating Marvel alive in terms of top comics sales. The thing with the MCU is that it was built methodically, piece-by-piece. Their whole shared universe approach was unprecedented, and they weren't in a rush to build their world. Now that the other studios see it as a viable option, they try to emulate what worked, or try to flip the script. That's where things go south.

It's not that competitiion should be stopped, I mean, I'm a big proponent of non-competitiveness, but this is one instance where I feel competition could be good, especially in terms of preserving quality and continuous improvement.