The only way to accomplish this at scale is to build something that is legit better and let the market decide. Anything else is just principled wishful thinking.
This feels different.
Up to now there hasn't a really good technical reason to want to switch from, say, Zoom to Teams (or vice versa). You might switch because of network effects: all your friends / coworkers are on the other one. But, video chat is basically a commodity (all work "good enough" and the features are broadly similar) and has been for quite some time.
What's different is that now all (or nearly all) the people contributing to the network effect simultaneously have a reason to want to switch. So the network effect, which was the only thing that was really "sticky" about any of these apps, is gone.