They technically already can, they’re just so depressed and bored they won’t, the trek universe we know could be Q’s personal creation so he had someone to talk to.

I think knowing there’s some limitation to what they can do would spark the fire back up tho, curiosity would have to get the better of them.

Edit: I have a theory that the reason Q is obsessed with Piccard is because he’s upset about his friend Q wanting to not exist anymore and the guilt Q felt about Q being locked in that asteroid, Q found and obsessed over Piccard to alleviate some of the feelings he had, like the trial is Q lashing out at Q, then I think after time he grew to enjoy someone standing up to him and kinda becoming a good friend (untill he met Janeway of course, Q’s true human friend).

Q’s just a sad person dealing with the loss of his friend, who has been left alone to deal with it, untill he finds a lost dog to befriend.