I know man, it's tough. Although once you get a higher and higher town hall, most attacks are air anyways so walls really don't. I would say in your case, just do the walls last after you get all your stuff upgraded and your upgrading your town hall. Or do walls when you just have to get rid of resources because you know someone bigger is going to be a dickhead and 3 star you. Now it costs me 1,000,000 gold or elixir per wall. Give me a break, lol.
EDIT: I just noticed you are a pretty rushed th8 which could be the reason you are struggling to get enough resources to upgrade walls. As you go up and up, your percent of loot you can get from each raid gets lower and lower so that leaves options of attacking all day or get more trophies to fight better guys. Other then that just keep chipping away at them!