Pay some random guy on the internet to upload for you. Yes, your voice will get you identified. Keep in mind that even a voice filter won't be enough to protect you from authorities. Some people use AI voices instead of theirs to stay anonymous
Adding to this, uploading audio/video instead of text means a lot more info and metadata for future adversaries to chew on and discover what you might be hiding. There are instances of people being traced to their country/city based on tiny details like the electrical outlets on the wall, geographical features and noises from nearby electronics like national news broadcasts.