If I had a team of several million people, I could build a sustainable city on Mars.
As long as I could be totally devoted tot he task, and the willpower to follow through the billions of setbacks you'd hit on the way, especially including my own ignorance.
Trump fixing H1b? It's possible, but similarly absurd to expect.
The Trump coalition isn't the team to fix H1b. They're a wrecking crew, not a construction team. They can foist individuals to make plans, but they're philosophically aligned against, say, the kind of planning that would make a national constitution or something along those lines.
Even if theoretically Trump actually meant the half-dozen things he said on H1b, and DIDN'T mean the several things he said that contradicted that, he'd still need to coordinate with a team that implements it, and a political base to enable a political climate that will make disobeying the rule a bad idea.
Trump could GET folks on board to get all that done... but at this point, he'd really need to construct everything needed from whole cloth. I somehow doubt that enforcing and enlarging H1b rules on the nation's CEOs is going to be a high priority compared to everything else he wants done in the world. It's POSSIBLE, just very unlikely, unless somehow Trump is thwarted on literally every other big thing, and yet not impeached.
H1b is a horrible system. It's virtues are nice - getting qualified folks in to do needed jobs - but that does not justify a system of modern day quasi-indentured-servitude. The way it's used it horrible too, basically used to quash local workers wage increases. Trump speaks against it, but he's exactly the wrong person to choose as a person to crusade against it - he's basically the living avatar of the idea of shortchanging workers using sketchy legal tactics.
Don't expect too much from Trump on this.