I get a shared universe worked for Marvel but DC is even further behind than they were in 2013.
DC always embraced the multiverse aspect and it's a shame Marvel stole their thunder, but Marvel isn't going to do much with that outside of a few projects. I really think I'd be smarter on DC focusing on projects that embrace the creators behind it. Not saying there can't be a shared universe but clearly, that formula is a struggle for them.
Different interpretations can co-exist, Flash is kind of in trouble but the whole multiverse aspect is there and they'd be better off putting their foot down and making future projects centered around the story, not the universe.
If they see an actor they like in a role cast them again, do some synergies when it works, but leave the door open for multiple things. From, a business perspective, this might actually be dumb but I do think with the right marketing they can rebuild what they lost by starting over and allowing breathing room for the movie, show, cartoon, etc. rather than everything being interconnected.
I still watch the MCU but there is a level of sameness from a formula standpoint that I actually think took away from a few projects that had the potential to be drastically different. The same universe doesn't need to equal same tone, and that could be what DC does to separate themselves. But I still find it far more limiting. Plus, I do think some characters need to be recast, the performances are mid for a few.