The districts plugin is available for people to claim their land. I will add additional plugins on request if I feel they help server without removing too much vanilla survival. Turn left outside of the castle and claim your districts. I have increased the speed that districts provides blocks because I didn't install it to limit your building but to protect your building. IF you have issues with permissions to use some commands, please be patient as I am working on giving you those permissions. You should currently be able to tp and  gamemode.