1) Adopt the FairTax. Now. Abolishes the IRS and all of the embedded taxes and puts the tax on the retail level for new goods only. Because all of the embedded taxes are stripped away, and the FairTax is inclusive, NOT exclusive, you would be paying nearly what you are paying for goods now. EVERYONE pays into the coffers now -- tourists, illegals, underground, etc. Much harder to avoid paying taxes now, unless you and the retailer are both willing to stiff the gov't, and I doubt they are going to be willing to do so. Many pluses for it.
2) Reform immigration. Now. Trying to deport Tens of millions of illegals is impossible. But a good start will be to take away a lot of the incentives for coming here, if not done legally. No one can fault them for wanting to come here. I would, if I were in their shoes. But to knowingly and willfully skirt our immigration laws is... well, illegal! And that should mean something. Many other countries, Central American ones included, have much stricter rules on it than we do. So why should it be different for us? Don't just pound those coming in, take it to those hiring them. But we can do this in a much smarter way. A faster system for getting a green card. Random checks by INS on employers would help, and for every illegal alien you have, you get fined $50k or something. Force them to do things legally. In today's technological world, we should be able to push the paperwork, background checks, etc. much much faster than it is done. Those that have done it legally should be the ones pissed the most about this whole issue.
3) Reform the Healthcare system, but do it the right way. There are solutions out there, and the ACA was not the way to do it. Taking some ideas from Congressman Tom Price's bill (HR 2300) is a good start. Eliminate barriers such as only a few insurance companies being allowed in New York, yet dozens are allowed in other states. It stifles competition, and inflates prices in those states.
4) Term limits. No gov't official should be allowed to serve forever. For Congressmen, having to be re-elected every 2 years is just dumb. They are perpetually campaigning. Up it to 4 years and don't allow them to serve more than 3 terms. Senators, leave at 6 years per term, but not more than 2 terms are allowed. Career politicians are killing this country. Justices should be looked at too. No one should have a lifetime appointment.
5) Completely turn our education system on its head. We continue to fall further and further behind other countries in nearly every category (math, science, etc.), yet we continue to dump billions into it every year. Obviously it ain't working! Take a look at how some school districts do it locally, where they have successfully turned things around. Certain inner-city districts are good models for this. How did they do it and what can we learn from them nationally? The two major teachers' unions are killing education, not helping. They only have themselves in mind and keeping power, not the kids' best interests. There are many other things that can be done here.
That would be a start...