You can have the most secure encryption and obfuscation, and it will be useless once they trick or intimidate you into giving up your passwords. The only way is to just not bring anything of importance. Get a separate phone or wipe your existing one of any sensitive things (password manager, personal/sensitive chats, chats or social media that may go against current administration's ideology[0], etc), you can restore things later

[0] https://newrepublic.com/post/192946/french-scientist-denied-...