You might consider Wafrn, which is a federated system like Lemmy. There are four instances listed there as open to new accounts right now.
You can even post to Lemmy with it, and people will be able to follow you with Mastodon, Pleroma, Misskey, etc… and optionally, Bluesky.




It doesn’t look like the major instances forbid posting in Portugese, and it’s ActivityPub+AtProto, so people can follow you from Mastodon and BlueSky. It doesn’t really matter if your audience is local.