• Storage upgrade for hauler drones
• Speed upgrade for all drones
• Farm size upgrade for crop farm drones
• Farm size upgrade for tree farm drones
• Other drone range upgrades
• Damage upgrades for fighting drones (Archer and melee)
• Float upgrade? (Which would make them float on water instead of sinking)

Comment here if you have an idea!

Yeah I should probably change this to a general TODO instead of just upgrades

• Equipping drones with different tool and weapon types (wood, stone, and iron)

• Equipping drones with enchanted tools and weapons