Then improve your education system.

Tied to income? No, thanks. Income does not guarantee intellect in any kind or form -- look at Trump.

How can you do that with incompetent people in charge?

And the republicans will reign for a thousand years. Unless we also restrict voting to under 50 years. Then the thousand year reign will be for the Democrats.

So voting from birth?

-Age to vote increased to 26 -> Age does not guarantee intellect. The vast majority of those who voted for Trump were over 26.

-Minimum income of 30k/year -> Again, income is not a measurement of intellect. White voters of medium to high income were those who voted for Trump. That's exactly the bracket you propose.

-Minimum IQ of 105 -> IQ is a fraud measurement standard. It produces wildly different results on the same person, and is no longer considered a scientific measurement of intellect. Even so, very few are actually tested for their IQ using appropriate methods, so we'd have no way to know other than what each and everyone declares. Absolutely useless proposal.

Because only the wise, successful and intelligent vote, we will instantly get better politicians! -> Nah, it was the rich white who got us Trump, so the wise, successful and 'intelligent' are exactly the opposite.

Allowing only the poor, minorities, and those lacking access to education to vote would likely yield far more reasonable election outcomes.

But a democracy only works with nations with an average IQ around 100. Much lower and corruption and tribalism completely take over. Sauce? Or is this just you coming up with stuff out of your head?

Restrict voting to a certain income!? Seriously!?

That's one of the most stupid ideas I have ever heard.

Slightly off topic but there are democratic schools where each student and teacher gets an equal vote and the school operates in a free market. The students are encouraged to create businesses and sell products and services to the school community and beyond. Just thought I'd put that out there.

The Chicken before the egg argument?

Besides... Other countries have been successfull at it, so take a look at the precedents they have set? The American Education system has allot of privatisation relative to other nations, which seems to have helped inflate costs which restricts quality education from those who come from poorer-backgrounds, regardless of how intelligent they may potentially be.
The Public education system is not purely controlled by the federal government, it's controlled by state and local government branches as well, so you do have outlets to make your voice heard, get people on-side to enact change.