Tatum had at least 14 movie projects between 2014 - 2019. And has an upcoming one in 2021 that he is directing. Respectfully, I disagree about his 'hold' on his career.
I respectfully disagree with your respectful disagreement.
When Channing Tatum came on board for the Gambit film he was at the peak of his career and popularity and was poised for leading man roles in major studio films. But the film he was most interested in by far and was a producer for was the Gambit film. He wanted that to be his big break as a big budget leading man role.
Films like 22 Jumpstreet, Jupiter Ascending, and Magic Mike XXL were obviously already in the bag by the time he was working on Gambit. After that he has like 4 supporting character roles, a bunch of voice acting performances and a few tv appearances. That's it. I mean, sure he kept busy, but he didn't capitalize on his star power at the time because of his investment in the Gambit film. This is just fact. And his directorial debut in 2021 is clearly after Gambit fell apart so that's irrelevant.
It also didn't help that after Gambit fell through, his passion project, he went through a sloppy divorce. Point is his career could be in a very different place right now if he didn't go all in with FOX on the Gambit movie.