Strategy questions related to a specific match agains ai

The match was DE vs hardest ai, arena, me - magyars, ai - vietnamese.

I restarted it 5 times and I just cant win. I can outboom the ai, I can beat it to castle, to imperial, I have plenty of resources, lots of production buildings, but I just cant seem to win fights.

The AI spams pretty much everything, rattan archers, imperial skirms, halbs, rams, elephants.

I dont know what units to use and how.

When AI spams everything, I feel like my units just never fight effectively, my hussars always seem to be fighting halbs, my archers always seem to target rams or skirms. I cant micro every single unit to stop if from doing dumb things :(

AI never uses formations so onagers/scorpions are useless. Outnumbering them doesnt seem possible, they have so many production buildings that even if i made more, i dont think it would matter, the units are already produced faster than they can die, I am already at 200 pop most of the time.

Raiding doesnt seem to do much, the AI can micro everything unlike a human and it tends to build its economy in a way thats very difficult to raid effectively. Besides, once in imp it can just replace it villagers quickly.

My observation from several DE games is that melee units suck and are unreliable, they frequently just flat out refuse to do what i tell them.

Generally it seems that when i fight against AI, if i have a good ranged unit that outranges ai, I win, if i dont, i lose. In this match, I cant deal with rattan archers and imperial skirmishers, so I lose.

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What do I do? I am not interested in advice on rushing or build orders, I am specifically having problem with late game. Thanks.