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Just host your own IRC server and migrate to IRC? /s

Or just use a popular, stable, free IRC network such as libera.chat.

A lot of very good IRC clients are available for free.

IRCCloud is a good starting point for a lot of people: excellent UI/UX, a free tier, and a very inexpensive paid tier (around 4 USD/month).

Create as many channels as you like.

This, but without the /s.

I tried this and the server crashed a ton and was unstable; I used their official deployment guides to a DigitalOcean VPS. Nuked the VPS and stuck with Slack.

I'll probably give Zulip a try before I go back to Mattermost.

I can say plenty of bad things about Mattermost, but it's been completely stable on my cheapo Digitalocean VPS, running night and day for at least three and a half years.

yeah, ive been running mattermost on a server for years. Very stable.

Just migrate to SMS?

Just migrate to RocketChat?