I would get a list of unsolved problems, and full access to all the people who might know part of the answer in different fields, and solve as many of them as possible, by connecting things in ways nobody else saw.

I want a lab, someone who knows safety so I don't kill myself, and a budget.

As others have said, I'm not extremely qualified in anything, but I'm willing to learn, and already know a lot of odd things.

I can fix ANYTHING if given a sufficient time and budget.

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[Edit]

A list of specific projects I'd like to work on

build a machine to mine the moon or mars, and replicate itself, or build a bigger version

Evangelize Capability Based Security/Multilevel Secure Systems so we can get back to actually owning our own general purpose computers.

Document the shit out of the libraries for Free Pascal/Lazarus, there should be a working code example for each and every unit, object, function, procedure, property, etc.

Set up, document, and popularize a second separate non-overlapping supply chain for civilization. Document the process, to help make humanity more antifragile.

Build a machine shop from scratch, and figure out how to offer a parts kit with castings that anyone could purchase and build as well.

Put an optical lattice clock at the top and bottom of a mineshaft, and verify relativity below the surface of the earth (as near as I can tell, the experiment hasn't been done yet)

Help find innovative ways to use free energy technologies the government has been hiding for decades.

Develop technology to stop those little drones from harassing our ships at sea.

Build a magnetic core based computer capable of operating on the surface of Venus.

Help transition Bitcoin to proof of stake instead of proof of work.