It's not just you. What happens is that when a platform gets too big, lots of people start making the same type of content because they see it works. Portuguese TikTok is relatively small, so it's easy to get the feeling that there's a lot of repetition. New creators see videos that blow up with views and try to copy the formula, which makes everything seem the same.
The algorithm is also to blame - after you've seen one type of video a few times, it keeps showing you variations of it because it thinks that's what interests you. It becomes an annoying cycle. What you can do is vary what you search for, follow smaller creators, or turn off recommendations for a while. Sometimes Portuguese TikTok has bursts of good content when someone comes up with a different idea, but you need to look for it.