You can upgrade the Silo to get more space.
1. Open the Silo and tap Upgrade at the bottom.
2. Collect the tools required for upgrade: trowels, drills and stone.
3. Tap Upgrade.
You can also sell goods right from the Silo to free up space.
1. Tap on the item you want to sell and tap Sell.
2. Select the required quantity and price in the window that appears.
3. Tap Put on Sale.