I LOST ALL GAME PLAY! Pls help

this morning I played both offline and online that could have saved data that I need. I had to resign into Xbox account it was offline and I opened the game and it started brand new. When I switched to online it synced the data from when I re opened it while offline. The new data is what the game is using right now and I need my old data so I can recover all my game play!
Thanks