Long-term, switch to another messenger app that's opensource and truly E2E encrypted.
That also shows why this is such a foolish proposal.
The truly scary people are not on the "consumer" chat apps anyway and most certainly will be the first ones to switch to another communication channel if this passes. If this will have any effect it'll be that some, "dumb" criminals will be caught.
Then there's the whole kerfuffle about how to actually implement this
So the thing that comforts me is that it's a dumpster fire all the way down and I'm sure there will be plenty of legal complaints about it