Quantum computers are on track to make conventional encryption vulnerable by 2034. Anything of permanent value will become fair game to hackers and government actors. The time to use quantum-proof encryption is now.
The US National Institute for Standards and Technology ran an international competition that began in 2016. More than 80 quantum-proof methods competed. The winner was announced in 2024: Crystals-Kyber, the foundation of KyberLock.
Besides being very secure, KyberLock is very easy to use. You can run it as a web app or download it to your device. You only need to come up with a secret Key, which you'll never need to change. The app maintains an entirely local directory of people with whom you can exchange encrypted information.