Earlier today, it was announced that the rhythm game, Love Live! School idol festival, will be terminating its service on March 31, 2023. However, you'll be able to transfer your game progress from the original SIF over to the sequel LLSIF 2 MIRACLE LIVE which is scheduled to be released in the future.
Data transfer will be available from February 2 until March 31, which is also the same day when the original SIF is shutting down. Honestly, I'm really saddened to hear that the game is shutting down, as I've had a lot of fun playing it, but I guess a new chapter does have to be opened for when LLSIF 2 does get released, huh?
You can read more details about how you can data transfer your progress from the original SIF over to LLSIF 2 here:
https://lovelive-sif-global.bushimo.jp/gtc1