Renaissance: How about weakening Renaissance by limiting how many track advances you get: Age 1: 1 step, Age 2: 2 steps, and so on. That lowers the impact during early game
Dictatorship: If someone plays Dictatorship and locks you out from your ONLY possible move although you still have resources, you are allowed to pass (and maybe pay a "fee" of one resource to be allowed to pass) and continue on your next turn. For the purpose of this rule "Income" is not a possible move.
Marriage of state: You have to spend one resource every time you copy the benefit the other player gets (or you have to give the original player the resource)
Age of discovery: if you do not want to be forced to go up because of Age of discovery: Spend resource(s) to be allowed to stay
Historians during game: Distribute only as many cubes as the Age you are in. After that use them as usual at the beginning of every income turn. That will limit their impact if received early in the game
Dictatorship: If someone plays Dictatorship and locks you out from your ONLY possible move although you still have resources, you are allowed to pass (and maybe pay a "fee" of one resource to be allowed to pass) and continue on your next turn. For the purpose of this rule "Income" is not a possible move.
Marriage of state: You have to spend one resource every time you copy the benefit the other player gets (or you have to give the original player the resource)
Age of discovery: if you do not want to be forced to go up because of Age of discovery: Spend resource(s) to be allowed to stay
Historians during game: Distribute only as many cubes as the Age you are in. After that use them as usual at the beginning of every income turn. That will limit their impact if received early in the game