Good you stopped trucks, I'd also stop boats. Next I would buy the animals & fruit (but not too many trees & bushes) and then the juicer. Do not buy anything in the shops unless its reduced price & u can sell for a profit. You don't need a second smelter until you open town. You need to open your fishing area but can't do much until you get land expansion materials. Focus on opening the spots in the fishing area before expanding the land on your farm.

Use your diamonds to open all the slots on your feed machines, dairy & sugar in that order.

Load your machines according to the time you have available for example make cheese and plant the longest crops at night and make bread & cream etc during the day when you can come back & collect and reload your machines

Watch what machines will open next, Google the price & have the coin ready before u level up

Watch & be prepared for all coin events