It takes years to deport a non-felon illegal immigrant who has a lawyer. Nothing Trump can do about that. The only way he could significantly increase deportations is trying to find the estimated 950,000 people who already have removal orders but are hiding out. But that is 0.3% of the US population.
Any large reduction in immigration would have to pass the Senate, which will never happen because most senators supported Rubio’s bill to increase immigration.