Fixes to complicated problems are rarely "simple and obvious", except to people who are rather simple themselves.
Setting a wealth tax at any fixed number, whether it's $10M or anything else, is simply stupid. You need to index for inflation at the very least. The large cost-of-living differences across the US are also a critical consideration.
Taxing capital gains at the ordinary income rate would be hugely punishing to the middle class, whose retirement savings are largely tied up in 401(k) accounts and real property. You'd devastate those members of the middle class who have tried to do the right thing and save for their later years.
Are "stonk transactions" supposed to be "stock transactions"? Those are mostly interstate so sales tax wouldn't apply anyway. I really don't know what you're hoping to accomplish with this one.
Corporate income tax is a sop to people who don't understand taxation. Corporations have all sorts of avenues for burying income, and the larger they are, the better they are at it. Corporate income tax punishes small businesses disproportionately; they're regressive. There are better ways to remedy the corporate-wealth problem, such as amending the tax law to remove the buyback loophole.
FICA (the "social security tax") should be made progressive, or at the very least flat. Agreed on that one. The cap on it is purely regressive.
I'm progressive. I believe real income tax rates are too low, and the Federal income tax is overall regressive. But most of the fixes (FICA aside) are neither simple nor obvious.
And, to be honest, I'd rather expend political capital on problems I think are more pressing. In the US economic realm, that would include access to health care and basic needs, sufficient retirement income for those in the lower and lower-middle brackets, student-loan debt and the cost of education, and so on. Outside economic security it would be things like police violence, incarceration, the surveillance state, and excessive police powers being handed to various agencies under the DHS.