Augustus time Conquest

The other half of the map will collapse quite quickly. Deploy your gens and sweep corners of the map, making sure to avoid battles as much as possible and head straight for enemy cities.

Depending on who survives and the severity of the enemy spam, spam troops accordingly. The best is to aim for the areas with the weakest and smallest belligerent state.
For Rome-Octavian, your gens should move outwards from Gaul, targeting the Namnetes and Nervii outwards, as well as the Cantribri to the Pirate islands towards North Africa. The rest should hold and defend the Noricumi.

Don't call in neutral states like the Roxolani and Illyrians until you can secure the region around them. If your front collapses, they may get knocked out instead.

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Once you have enough resources, spam elite troops every turn: heavy inf and heavy cav.