BTC and XMR are good tools, yes.
But don't let that take over your life. It will not make you happy, and you cannot take your secret keys to the grave.
Follow Christ -- the Way, the Truth, and the Life.
Discussion
You can't, but you can live it for future generations.
Ciphers exists to today, image 100 years from now, someone made a strong encrypted cipher with btc or xmr on it.