Couldn't help but notice your post of your gold lost. Sorry to hear that.
To help you recover your loss. Here are a couple of tips on how to earn gold through the game. First try to log in daily. The weekly rewards is gold. Now it's not much but over time it adds up.
Save up 3500 gold then keep an eye on your parking lot for the "Big Farm Deals
" to visit. Omar, the old man tending to the cart has a Gold Mining Licence (GML) that he'll offer you for 1500 gold. Buy it then start it with the 2000 gold in your level 2 mine or better. Once ready to harvest you make 500 Gold each time you can do this.
Watch your regular mystery chests/boxes as you can find a GML about once every 100 you open. There is also other smaller gold prizes in them.
For almost every thing Big Farm check here https://crazybigfarm.net/index.html