I'm not a psychologist, but it sounds like you've got buyer's remorse. You want a more expensive bike, and are using the excuse that the one you have is not fast enough. That's not a valid excuse. If you want a different bike, you won't be happy until you get it, so go for it.
As far as going fast, there are no "cheat codes" or shortcuts. It takes time. Good luck to you whatever you decide, and ride safely.