Implement Post Quantum Cryptography
It would be great to provide PQC (Post Quantum Cryptography) additionally to the cyphers that are used now. So for each encryption part (certificates, TLS, DHT, message encryption, add-new-device encryption, ...), a quantum save cypher should be added additionally to the asymmetric not quantum save alternative that is used already (or will be used in a new release of the corresponding crypto part). For symmetric crytpo, it would be great to use at least 256 bit, for example in hash functions output or keys for AES or ChaCha20.
This would prevent "save now decrypt later" attacks.