Do not waive any of your rights. Law enforcement, border patrol, or others may try to speak with you, try to gain confessions to key facts or elements, and most importantly may try to get consent to search you or your property – most importantly your cell phone.
Invoke your right to remain silent and your right to have an attorney. Ultimately, giving a voluntary statement to law enforcement may actually help or assist your case. But that is never the case unless an attorney is with you, having gone over your case with you, and having spoken to the government to ensure you are protected in doing so. By speaking early on, you can make your case harder to defend and potentially increase your penalties.