Can I ask what's wrong with Zulip? I have pretty minimal experience with it, but I've mostly heard positive things. I'm curious what your team has found limiting.
If you like the communication flow of Discord, Fluxer is also worth keeping on your radar. I would never trust my essential comms with Discord personally, and Fluxer is looking to be a great option.
The web UI has become extremely slow. I am not sure if its that way for everyone or its because there are more people in our team using it. Many people dont like the UI too although that isnt my main concern
If you like the communication flow of Discord, Fluxer is also worth keeping on your radar. I would never trust my essential comms with Discord personally, and Fluxer is looking to be a great option.