The way to approach a problem like this is through research and moodboarding - explore popular products in Brasil among the demographics and market your client is targeting, look for clues as to changing trends, explore things (in Brasil or anywhere) that have the kind of personality you want, assemble a big board (physical or digital) of examples of things that have the kind of personality you're looking for, compare it to the competitors, and then use this when your browse fonts.
When you find something that looks plausible, take it to your moodboards and think, 'How does this fit?'
How to create mood boards: 35 expert tips (Creative Bloq)
As you can probably see, this all depends on the exact nature of the brand and client you're working for: so it's something you need to do yourself. People who know design trends in Brasil might be able to suggest relevant local styles and trends to be aware of, but they don't know your client.
If a random stranger on the internet could understand your client and their needs as well as you do, your problem isn't fonts: it's a sign that you need a deeper understanding of your client.