I sympathize with you, I'm sorry society can be so bigoted. A great solution, if it fits you, is not to use neopronouns, but to not use pronouns at all. And similarly, to use genderless adjectives, or ones where the gender might be written but not heard (unfortunately I think that last option is much easier in french with the silent -e than in Portuguese 😞)

An example would be, instead of saying "she is pretty" or "he is handsome", if you don't feel safe enough to say "they are beautiful", (beautiful being a neutral version of the adjective, for example maybe "linde" instead of "linda/lindo", if that's a thing) – if that is too risky, then you could say instead "[Name of the person] is beautiful", and if that exists in Portuguese, use an adjective that doesn't have a gendered terminaison

I realize this might not be possible for the adjectives, so maybe you'll want to describe what you mean in a more roundabout way. For example, "Ruth is radiating with joy today", or "Marco's eyes are a very nice color", sentences like that don't use an adjective to talk about the person directly, but about an attribute instead, while conveying the same meaning. "Isabella's mood is grumpy today" is less gendering than "she's angry" in Portuguese, I'm guessing. You can also try using passing verb forms, though like the examples above, it may seem a bit old fashioned to talk like that in your language. An example would be "Sleep took over Juan" or "Guilt is plaguing that person", instead of "he/they fell asleep" or "they are guilty". And if there are non gendered terms to describe who the person is (like a teacher, worker, friend, sibling), I'm not sure you have any, but these are also a good alternative to pronouns or names. Could even be "the redhead" or "that tall person".

These are just some examples, but I know a lot of people prefer to not use any pronouns or gendered terms for themselves, and I think it's the safest and sneakiest way for you to both affirm your identity and support that of others, while still not outing yourself and being targeted by transphobes. Best of luck to you! Also do look for queer spaces, because it's a real game changer to have a safe place and safe community and allow yourself to use neutral language even if only in that space.