Corrected version (not rearranged) -

All of these things listed below: software only, not capable of having end to end encryption 

Discord: you're pretty much right except it is encrypted "in a way," just not in the way that matters (end to end - not possible in software)

SMS: again you're kinda pretending end-to-end encryption is the only encryption

VoIP: no it doesn't separate you from a cell tower. To separate from cell towers you have to actually separate from them, using VoIP over cell data does nothing. It separates your location from an area code for caller ID maybe

Signal: same as discord, not end to end encrypted (software-only)

Matrix: not end to end encrypted (it's only software, like signal and discord) but with track record for waiting before revealing MITM attacks (unlike signal and discord who have been open about their MITM attacks on users)

Session: no end-to-end encryption (software-based), not sure about track record

SimpleX: no end-to-end encryption (software-based), not sure about track record

Self-hosted Tor XMPP w/ OTR: no end-to-end encryption (no specific hardware mentioned), track record probably better than discord

Conclusion:
Anything is better than Discord.

Additional communication method not in the original:

Encrypted hand-written letters - hardware solution, end-to-end encrypted