You can wipe your post history and delete your account, but if they own the NSA it doesn't matter. They have it all.

The best you can do is prepare your gender transition for sometime between arrest and conviction, hoping to get into a maximum sexy prison.

If that doesn't work, go trans-racial and join BLM/Antifa. Beg for the opportunity to punch a nazi and hope they accidentally let you out thinking you're a good communist agitator.