Sos signal

Ive been playing Terraria for a long time. Its a great game but one issue the lag and crashes. Ive had a world Ive played on 2 years. then one day I lagged and the game wont let me in my world. Now 2 years of my hard work was wasted. Plz help me

Cakesoldier101 about Terraria, v1.2.12785