Do you think it's possible to become successful in wrock in the UK? Could I still go to conventions and things?
Sure! There are plenty of successful UK wizard rock bands, and many of them have gone to several conventions. Riddle TM, Romilda Vane and the Chocolate Cauldrons, Siriusly Hazza P, Split Seven Ways, The Black Sisters (just off the top of my head). There's a convention in London next year, but I believe it's already sold out. If you want to go to a convention in the US, just save up for a flight.