Town Hall 9 is a heavy grind for both heroes and walls. Barbarian King and Archer Queen has 50 levels of upgrades combined, and every wall piece can be upgraded twice, at a total cost of 3.000.000 gold (or elixir). My advice is to take your time, don’t rush it, don’t stress it. The time spent at Town Hall 9 is worth it. Make sure you max it out and make it count!