KYAA THE NEW CARDS THE GACHAS THE BACKSTAGE PASS THREE AND THE WHITE DAY RERUN HAS STARTED

oh noooooo I’m so scared I’ve been having problems getting a JP account because I’m on dumb family sharing, obviously none of you have that problem most likely but the only solution is looking like I’ll have to switch my main Apple ID to my JP one just to download it, but will it turn my whole iPad Japanese? Will it swap my EN Bandori account to JP and reset all my progress?!?? HELP