Market issues

I had not got a single Good card over 3-4 months and when I finally got a card, it was good actually because it was tradable and the value was very high 7,000,000,000. I was very happy and immediately tried selling him, the worst part is it's been 3 days and the player is still not sold. The value is down to 4,000,000,000. I'm badly frustrated and depressed. EA sports fc mobile is getting completely **bleep** and a P2W game, no money no fun. 🙏