As Rearra said, unfortunately it's not that simple. There are several choices in the game that can't be reversed. Sure, I can try to give you a save with all the cg unlocked and the quests done if you want, but if you use it to play after new update are out and new content available, you might find yourself dissatisfied with the choices that I made.
And if you don't mind me asking, how did you lose your save ? Deleted the game after downloading a new version and forgetting to transfer the save ?