Billy and Mandy never got in trouble around town
Fosters never got in trouble outside the foster home
Ed Edd n Eddy did get in trouble around town
There are some actual arguments to be had about how similar these shows you listed could be, but you've not presented a good argument for that being the case.
Even if you did boil them down to something similar though you'd have to say something like:>Kids do things
Because not all of them had magic, not all of them were groups of boys, not all of them were trios, not all of them had actual adventures, and not all of them had slice of life episodes. In fact kids doing things might not work either because Grim is an adult in the main cast.
The fact of the matter is that 3/4 of these shows all have the same starting basis, that being:>Girl goes to magic world and goes on adventure with small sidekick
And that's not inherently a bad thing, the shows can be great and diverse in their own right regardless of where they start from.
It's just that if that pitch doesn't appeal to you then everyone has a fine right to say that it doesn't, and people who tell others not to complain about things that aren't out yet are missing the point of being a consumer of media.
You state your opinion in the moment and let it change if it gets proven wrong. Attempting to make everyone say only positive things about something is cultivating a circle jerk, and you should probably go to like a fan forum for that rather than an anonymous messaging board.