Your alliance is doing this poorly. For example, it doesn't account for (a) war coalitions (b) attack ability (c) the opponent. Since your alliance wants to play it this way, be sure to choose offensive coalitions to help... especially as you get started. American is the most important so keep upgrading it.
Now, tell us what sort of troop composition you use and if you have a museum; and ideally your planes (the ones you use) are maxed.
The easiest attack strategy to master is the classic Commando attack; which means something like 10-12 commandos, and the rest bazookas. Also 8 fighters. War tactics are 1 or 2 decoy, a protect, and the rest Sabotage (maybe one assault rally). Search the internet for additional details, such as this old guide.
Another is to use all heavy tanks with either 8 fighters or 2 transport 2 fighters.
One key to attack is reducing the number of troops used. So, say all Heavy Tanks, or all commandos+bazookas; or a new trend is all mortar+cannon. This in addition to having a decent museum that mostly deals with air power.