For example, on WhatsApp, use the whole 25 character limit for profile name. Examples:
Bob Moved To Signal.org
Alice MovedTo Signal.org
CharlieMovedTo Signal.org
Say Signal.org, not Signal, because they won’t know it’s an app.
Use your about section too. Same on Discord, Steam, Instagram, etc.
It’s OK to stay on signal but to say no one is switching is untrue.
It was pretty small numbers before (darknet) but a youtuber called Mental outlaw did a video on it recently and now it’s exploded into the more mainstream privacy communities.
It isn’t perfect, and signal has a lot of perks but there’s no need to literally ignore new developments