I would want Benneteau to finally win his first title but it sadly doesn't look very likely to happen.
But based on your list
Shapovalov: He had a decent year this year with some good wins. I feel like if his game is going well, he has a chance to win a small 250 title.
De Minaur: Great year this year and some good wins. Could win a 250 title.
Hyeon Chung: Great year this year with a lot of good wins. I consider that the Next Gen finals are like a title, but if he remains healthy he will win a title next year.
Auger-Aliassame: Good young player but I don't see it happening next year.
Taylor Fritz: Good young player with some good wins and he has a chance for a title.
Jaziri: Played very well this year and had good wins and I see him winning a title.
Lajovic: Also had a good year and could win a title.
Mannarino: If he gets his head right in a final he will win one.
Millman: If he remains healthy he will win one.
Ok so I was right with Shapovalov, De Minaur, Fritz, Lajovic and Mannarino. But its insane how many others I just did not see coming, like Sonego or Garin. Does this year hold the record for most amount of first-title winners? Although I'm guessing next year there will be few first-timers.