I started using an application called Franz recently to help me view an unwieldy load of messages on several platforms for multiple projects. I had used Adium before but it died in 2017 with macOS High Sierra, I think.
Note that this is a desktop application only.
I love that Franz includes GCal, because scheduling meetings are critical with working groups, volunteers, committees, and recently, reunions. Technology and a soft, persuasive touch help get busy people together, and switching to a person’s favoured platform helps. After all its to help protect the environment and promote harmony!
Switching between services is a keystroke away – I’ve arranged it as Cmd-1 (What’s App), Cmd-2 (Telegram), Cmd-3 (Facebook Messenger), Cmd-4 (Twitter) etc. Franz can handle emails too but those are much more scary so I restrict those to mail programs.
Franz is available on multiple platforms at meetfranz.com.