Wow, changing your mind so quickly on a 2.5k purchase, part of me wants to ask if you really thought it through when you bought it but I won’t go there…
If it really is only a month old and not used much you could try going back to the shop, being honest and saying ‘look, I think I might have made a boo boo when I bought this, any chance of a PX/buy back deal on a different bike?”
They may tell you to do one, but they may be receptive, it would have to be worth their while so you would still lose a bit but likely less than if you tried to sell privately with no warranty etc.