I think the only three alternatives that can compete with Jami is XMPP, Matrix and Sessions. However unlike XMPP and Matrix, Jami is a P2P where as XMPP and Matrix is federated like email. Sessions uses a Tor like system but is not P2P like Jami.
I hope someday Jami implements some kind of “VPN” setting like Tor or the Loki network which can be enabled or disable