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It was free, but it may be in credit store. If not, just wait.
Yeah we do have a path for all operator skills, scorestreaks and BR Classes to eventually land in the credit store to add an option to acquire them that way if it was originally missed. However, those were all free/grind options originally as well, whether it is through an event or the free side of the Battle Pass.
Your game and Wild Rift are IMO the best Free to Play mobiles made so far. I used to love Mobile Legends but felt so dirty with how much money they would try to fleece out of you...
Well, thank you very much for those kind words! We have done a crazy amount of work over the last year and half (since launch) to try to balance that all and make it feel rewarding for all players.