I can't expand my towns in Pangaia 3

  • You can buy "lock" by using Ambrosia that gives you double amount of resouraces saved.
    Or just send from another town and quickly build up.
    But most buildings you can upgrade with the basic saved resources (about 40-50k - level 28 warehouse you can build safely).

  • Keep building and expanding and don't stockpile your resources. Make sure you have at least two warehouses in your cities and upgrade as much as possible. Have your own little army to defend yourself and keep spending your resources on expansions. This gives you score instead of letting them staying vulnerable.