Advice on army for my mage

[Stepsongrapes]

You definitely have too many slow hitters. Dwarves, ents, and, giants combined in one army is part of your problem. Certainly lose either the ents or the dwarfs + giants.

Mix in more range and try to avoid morale lowering combinations, like the elf/dwarf problem you have here. Frankly, what you use should be somewhat dictated by what artifacts you have at hand. With the unit mix you have, I have a hard time thinking of good artifacts that benefit such a mixed bag army.