Italy. (All game modes)

Advanced Politicians.
Current Effect: The next Age up researches faster (-25% for Commerce Age, -50% for later Ages) and all Politicians now grant additional rewards
Modification: I would like this card to also affect revs, perhaps it could guarantee one or two shipments, or give a factory build cart.

Statuto Albertino.
Current Effect: Provides the Basilica with Carabinieri, Risorgimento, and Papacy technologies
Modification: I would like to propose the following changes for the technologies on this card.
- Carabinieri: Reduce the cost of this technology by 50%, and now also allows that the revolutions to train and improve the Carabinieri at the guard level.
- Risorgimento: now also has an extra effect for revolutions, allowing you to train Redshirts from urban centers and normal revolutionaries from barracks and fortresses.
- Papacy: If we use or are in a revolution, this technology gives us the same effect as the papal arsenal card.
Personally, I am not interested in the imperial age of any civilization and that is why I am not very interested in adding these effects to the civilization, but in case it is considered something feasible. I am not opposed to Italy receiving the effects that I have just proposed for the revolutions. 

Roman Tactics.
Current Effect: Pavisiers, Pikemen, and Halberdiers get +10% hit points, and get +0.3% attack for each Pavisier, Pikeman, and Halberdier in a radius of 34 (up to +15%)
New effect (Previous effect is replaced): Pavisiers, Pikemen, and Halberdiers now gain the deflection ability, but only between archaic units. The Pavisiers gain 200% damage in the close combat stance. (sounds broken, but itâs not XD)

Guardia di Finanza.
Current Effect: Adds coin equal to 5% of the cost of all defeated enemy units to the playerâs stockpile up to a maximum of 3,000 coin
New effect (Previous effect is replaced): Deposits gold equal to 5% of the cost of all defeated enemy units into the playerâs Lombards. (permanent effect)

Sienese Financers.
Current Effect: Deposits 800 food into the playerâs Lombards.
Modification: Deposits 300 food with every shipment into the playerâs Lombards.

Luccan Financers.
Current Effect: Deposits 1200 wood into the playerâs Lombards.
Modification: Deposits 300 wood with every shipment into the playerâs Lombards.

Genoese Financers.
Current Effect: Deposits 1200 coin into the playerâs Lombards.
Modification: Deposits 300 coin with every shipment into the playerâs Lombards.

Florentine Financers.
Current Effect: Deposits 2,300 coin into the playerâs Lombards
Modification: Deposits 200 wood, coin and food with every shipment into the playerâs Lombards.
I clarify that the images have the wrong numbers because I took them from the wiki.
Germans. (All game modes)
Replace the Argentine revolution with the Chilean revolution.
Brazil. (All game modes)
The Voluntarios da Patria no longer automatically spawn, they can now be trained in barracks and fortresses for 50 food each and maximum in groups of 20 Voluntarios da Patria.
The revolution can train and improve, both the soldier and Cassador up to the imperial level.
PerĂș. (All game modes)
The Peruvian insurgent should be called an Andean insurgent, it should be able to be trained from home, have the effect of the reservists card as a base, in addition to being affected by the Alpaca Wool card and have a multiplier against infantry instead of against cavalry.
On the other hand, the Peruvian guard should have the loaded skill of the Mexican soldier and cost the same as the mounted grenadier.
Argentina. (All game modes)
All non-Argentine cavalry units should be replaced with consular versions, in addition to enabling the garrochista and the consular gendarme from the stables, fortresses and Galleons.
The infinite card of 7 lancers should be replaced by an infinite card of 6 Consular Garrochistas, an infinite card of 6 Consular Gendarmes should be added and the Creole card should replace the musketeer instead of only being able to train in the fortresses.
Incas. (All game modes)
The Incas urgently need a complete rework. I would recommend giving them an industrial and imperial age with gunpowder weaponry, access to the arsenal, light cannons and captured mortars. 
These are the changes that I would like to see in the game, I leave it to the developers to determine whether they are feasible or not. 