How about:
1.
Britons extra range on archers in castle/imp
2.
Ethiopians faster firing archers
3.
Mayans cheaper archers
4.
Vietnamese higher hp on archery range units
Or:
1.
Huns cheap cav archer
2.
Vietnamese higher hp cav archer
3.
Tartar free thumb ring/Parthian
4.
Mongol faster firing cav archers
In case you haven’t seen it, SpiritOfTheLaw has a great [video](https://www.youtube.com/watch?v=yd-MEP2p5iY&t=1s&ab_channel=SpiritOfTheLaw) on this!
Fast imp into gg:
Khmer – no building requirement
Italians – age up 15% cheaper
Byzantines – imp 33% cheaper
Malay – age up 66% faster