Well, the existing product already has critical mass, a new product - like the various Instagram clones, then the various Tiktok clones, then the various Twitter clones - all have to acquire their own customer base.
That said, other point: Why not just accept you're no longer growing? The company would've stayed solvent for years yet, with a steady group of users coming in and out over time as the brand becomes synonymous with thoughtful dating profiles instead of the rapid fire hot-or-not that is Tinder.
The endless pursuit of growth is incredibly destructive. A consistent profitable business is considered a failure.
Instragram was able to pull their users into Threads pretty easily without making Threads a direct part of Instragram. It is still it's own thing with it's own brand.
That said, other point: Why not just accept you're no longer growing? The company would've stayed solvent for years yet, with a steady group of users coming in and out over time as the brand becomes synonymous with thoughtful dating profiles instead of the rapid fire hot-or-not that is Tinder.