Your result
Not eligible
This route needs a Brazilian spouse or partner, and on what you have told us there is not one — so there is nothing here for you, and it is quicker to say so than to work round it.
If your partner is not Brazilian but holds a Brazilian residence permit, that is a different and real route: family reunion is available to the spouse or partner of a resident, not only of a Brazilian. It gives you residence, though not the shortened path to citizenship.
Otherwise the routes that do not depend on family are the ones to look at, and Brazil has more of them than most countries: remote work for a foreign employer, a pension paid from abroad, investment in a company or in property, a job offer from a Brazilian employer, and — for nationals of most South American countries — a residence agreement that needs no job offer at all. Any of them can lead to citizenship after four years.
And if you have a Brazilian parent or grandparent, stop here and take the citizenship-by-descent quiz instead: Brazil has no generational limit, and that would be a far shorter answer than any of this.
Tell us your nationality, your partner's status, and what takes you to Brazil, and we will point you at the right route.