The current COVID-19 situation is not helping DCEU movies either, we all know that WW84 wouldn't make same amount of money it could have made without any pandemic.
Last two movies (Shazam and Birds of Prey) while being critically successful managed to just break-even (for BoP, we would have to add money earned from the Theatrical run and money from VoD, streaming and Bluray sales)
Which means, if The Suicide Squad, The Batman, Aquaman 2, Black Adam, Shazam 2 and The Flash tank, you can say good bye to chances of getting solo Superman movie.
DC movies are not in a safe place as Marvel movies..