I'll tell you what I'm advocating and then I'll drop out because you kids are moving to fast for me.
I'd phase out social security.
Every adult in the US would have a Thrift Savings Account. It would consist of one retirement account that they can't really touch until they retire, and their payroll taxes would feed that, and the government would supplement it such that they had a minimum amount at age 70. The second account would be an account they they could always use in certain pre-established ways and they could always use that for certain benefits related to child care, health care and education. The government would determine how much someone needs to meet their retirement and social welfare needs and those accounts would pay for them. If you made above a certain amount, the govenrment wouldn't supplement your retirement or put in any money into your health and welfare and education accounts. Those supplements would be paid for by progressive taxes on earnings by the wealthier members of society.
(Based on my income, I'd enter age 70 with a relatively small retirement Thrift Savings Account, with the expectation that I'd have a 401k that I've grown. I would have paid for most of my kids education on my own. On the other hand, someone who worked at a call center their entire life might have a Thrift Savings retirement account which is triple mine due to subsidies he received. He may have also gotten subsidies for child care and subsidies for his kids college education.)
Tax policy would be based upon 1) funding general welfare funds, 2) infrastructure including regulatory agencies and enforcment and 3) national defense.
More people with a better and more structured social welfare net will have a positive synergistic effect on the economy and society.