My advice in the case of Morocco specifically would be to work towards the instrumental goal of getting those laws changed, rather than the final goal of promoting rationality. Morocco is a semi-democratic country but with extremely low levels of political participation by the citizens. That means one could have a disproportionate effect even by registering to vote (most Moroccans aren't registered), let alone by joining a political party. I'd suggest joining Movement Populaire or Union Constitutionelle, after a few minutes' googling. There's just about enough give in the system that one could make a difference in overall freedom there.

In a country without even that tiny amount of pressure one can put on the levers of power, like an outright theocracy like Iran or hereditary dictatorship, it would depend on whether the budding rationalist considered hir death a reasonable price to pay for increasing overall rationality. If yes, then supporting whatever underground opposition groups exist would make sense. If not, then just doing whatever they could to get somewhere with a saner polity would be the sensible thing to do.