I was really confusing about posting this question in the ASB page or here, but finally i chose. Also, it has a long exposition text, so be patient.
The reign of Pedro I as emperor of Brazil, also known as the first reign, was marked by instability and rebellions (including the only successful separatist movement in the country's history). Many of this problems were caused by the emperor, as Pedro closed the first Constituent Assembly because he didn't like the preliminary draft of the constitution they made (The draft established that only owners of a certain amount of land could vote; Pedro imposed a voting system based on income, instead). In doing so, the emperor gained the antipathy of the Brazilian agrarian elite and came to be seen as a tyrant. This motivated many revolts, like the separatist movement called "Confederação do Equador", and made the his popularity fall.
So your challenge is to make this period at least less of a mess. Bonus if you keep all the provinces (no independent Cisplatina/Uruguay) or/and if you can keep Dom Pedro I in the throne until his death.