Revenues went up because he raised taxes and spent more money and raised the debt. If the government spends $1.5 trillion, of course when that money is spent and someone gets more in income, revenue will increase. But revenues won't increase as much as the deficit amount spent.
Under Reagan massive amounts were spent on boondoggle defense projects, and when contractor are paid, of course some of what they get paid goes back in taxes. IF you think that adding willy-nilly to the debt just to raise revenue makes sense, it means you are a republican. If you think that adding targeted spending to the debt to gradually decrease the debt, it means you are a republican. These untargeted tax cuts being proposed now will only increase profits and stock values, a gift to the wealthy. If instead they took $1.5 trillion and built new roads, repaired infrastructure, modernized the electric grid, etc, etc, it would GUARANTEE more hiring. The repub plan is just HOPING that business does something good with their added profit, while infrastructure spending ACTUALLY accomplishes something good.