After battlepasses completed, a ton of time spent, Ive won all the skins I didnt want! Mammouth LC, Hunter Prime, Rail XT, Rail LC, Vulcan XT, Smoky XT, Shaft XT, Hornet XT, Dictator XT.... WHere is my thunder XT and viking XT??

Ive been playing tanki for long time, between all my time playing ive spent some money to get some XT skins, probably not but, Is there a way to exchange xt skin for another? I always wanted Thunder XT and Viking XT but instead ive had shaft xt, dictator xt, hunter ultra, and more..