I'm sad how do I fix my xbox from it turning off

I've done many things to help my Xbox but I can't replace it cuz I Will get a ps4 and in my opinion Xbox is better but I can never fix it I've tried going to game stop and many things and haven't been close to a full year also I tried to get a new one before the Xbox sires came out and they were sold out and I was sad I'm pretty sure I can't even get an Xbox for Xmas I've had so many memories and I have 500 and something friends and I don't wanna leave there sides:( I hope I can get help before Xmas if u have anymore things I can try plz help before Xmas btw 2020 worst year ever1 :(