Expand it. By that I mean increase benefits and create a redistributive effect by removing the tax limit (90K) and also eliminating benefits for the wealthy. That way it is an insurance program.
Social security is supposed to be a program where your money is put in and lent to other people. Then, when you retire, you get the amount that you paid into the system from other younger workers. Only problem is, that by the time I retire, No one will be there to pay me, so the result is a welfare program for poor people, not a retirement plan.