A lot of talk that says he simply wants to move back to England and the premier league as his next step, though the timing on that isnt this summer. You dont even need to be an itk sometimes, it's a pretty logical situation. Players don't usually move on after just 1 season, and he's still very young. Staying at Dortmund for one more season is the best thing for all of them, and then he'll move.
If he wants the prem, then that's that isnt it? Leaves the top 6 clubs, 2 of which he wouldnt start at (1 of those 2 who he left in the first place so unlikely he goes back), 2 who can't afford him (or anything close to it), one who just sold their best player and have a transfer ban and who will almost definitely have a few years of turmoil after being so dependent on Hazard (and who now have Pulisic and Hudson Odoi on the wings for their long term plan), and then United, who have boatloads of money, have the history, the size of the club, the reputation, have an easy position where he'd slot in and be the main guy, and we'll see next season if we make the top 4 (don't think that'll br a deal breaker, but anyway I think it's only going to be 5 teams fighting for it).