I think his next move's a tricky one. Dortmund have been perfect for him - young players get a real chance there, and he's developed phenomenally off the back of it. He's captained them this year and it fits him like a glove. In the unlikely event he stayed another year I'm sure he'd wear the armband full time.
But after Dortmund? Madrid sounds sensible, but he's a player who thrives on game time - will he get that? Camavinga seemed to have a lot in common with Bellingham when he went there but he's still not starting games. The last thing Bellingham needs is stagnation.
On the other hand, the supposed downturn at Liverpool might not be such a bad thing for him. Dortmund have been on a similar path, but the likes of Haaland and Bellingham have kind of papered over that, but Jude seems to have seen that as an opportunity to impose himself, and hasn't that gone well? Klopp or whoever could build the next great Liverpool side with him as the fulcrum.
Think ultimately it's down to him to choose a club rather than the other way round. Thankfully he appears to be fairly decent at making the right decision.