If that data is encrypted, it will take a CIA-style interrogation to get your private keys. Quantum computing is at least a decade away, and even then, it would take months if not years to decrypt enough data to net anything meaningful.
In the meantime, encryption will continue to grow and advance. They'll always be a step behind.
I can read what you are saying on FR just fine without having to decrypt a thing.
Oh, and one more thing. They WILL find something evil in your writings.
Even if they have to make it up out of whole cloth.
Who would dare doubt them?
They’ll bring in silken tongued expert witnesses who dazzle the judge and jury with their brilliance and utterly bury you and your public defender in bull poo.
Even if you luck out and get competent council, the federal judge can exclude evidence and the expert witnesses can claim the details are classified.