[Agrajag]

1) You can make your commander cast the same ritual repeatedly every month by using M for Monthly ritual.
2) Your troops don't deal enough damage? Agarthans have pretty high Strength, which means they deal quite high damage, especially the sacred giants.
My guess is your problem is low Attack, so your soldiers can't actually hit.
3) Your high-priced mages all have 3E - optimal for Bladewind (evocation 4), which is a very effective spell in EA
4) You should consider a bless strategy, you have the H3 to pull it off, and the Ancient One sacred could really use a Fire+Nature bless. (Fire so they can actually hit something, Nature because 40hp works well with regeneration.)