Do more stall sales and sell above cost to make. Example: Bacons and eggs. 2 bacons and 4 eggs. Cost to feed a chicken 7 coins, so I never sell eggs lower than 8 coins. I don't sell eggs in stall. I sell to neighbors who will give me about 10.5 coins for each. A pig cost 14 coins to feed and I always sell my bacons quickly enough at 45 coins each. Do some math: 90 coins for bacons and 42 coins for eggs. Total 132. So I choose to sell bacons and eggs for 150 coins. They always sell if I advertise.
I flip products too. I actually don't make bacons and eggs. I buy the under 60 coin ones and resell at 150

I made over 3000 coins on one ad from flipping products

Each time something sells I replenish.
Doing the above I always have the money to buy equipments and still have a lot of coins leftover at the level the equipment/mine/dock became available. Get rid of low xp truck orders and only do boards every so often.
Just a tip