Stay safe.
Do not use Signal or any alternatives based in the United States. Your messages still pass through Signal's servers.
There are alternatives to Signal that operate outside U.S. jurisdiction:
TeleGuard — Switzerland, Europe
https://teleguard.ch
Threema — Switzerland, Europe
https://threema.ch
Ginlo — Germany, Europe
https://www.ginlo.net
Delta Chat — Germany, Europe
https://delta.chat
These options include a mix of open-source and closed-source software, both free and paid — so there’s something for everyone.