Aren't gravity and magnets related strongly to one another, and if yes, wouldn't that give us our TOE?

TOE(Theory of Everything) will be achieved, loosely speaking, when we unite these two groups of forces:
1) Electromagnetic force, Strong Nuclear Force, Weak Nuclear Force
and
2) Gravitational Force

We can generate electricity indirectly from gravity in waterfalls (also must be used elsewhere too). Like we united magnetism and electricity as electromagnetism, if we are able to unite magnetism and gravity, then we would be uniting gravity and electromagnetism,
Now, gravity holds us onto the earth. A magnet can hold iron filings onto it. Gravity can bend light, because it bends the entire space-time. But a strong magnet on earth cannot bend light as light consists of photons that don’t have a charge. However, how do we know that a much stronger magnet wont bend light? Also, since magnets have poles and therefore can both attract and repel, if we get to unite magnets and gravity, then we can consider gravity as having poles, and therefore explain that gravity could be behaving as attracting force sometimes, and as a repulsive force at other times, thereby explaining the expanding universe as repulsive gravity acting between galaxies.